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| A227381
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Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order
(history;
published version)
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#5 by Charles R Greathouse IV at Fri Dec 18 18:18:37 EST 2015
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Number of n X nXnn 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order
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Discussion
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| Fri Dec 18
| 18:18
| OEIS Server: https://oeis.org/edit/global/2478
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#4 by R. H. Hardin at Tue Jul 09 13:20:23 EDT 2013
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#3 by R. H. Hardin at Tue Jul 09 13:20:19 EDT 2013
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allocated for R. H. Hardin
Number of nXn 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order
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| DATA
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2, 7, 54, 1104, 61127, 8988949, 3657501287
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| OFFSET
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1,1
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| COMMENTS
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Diagonal of A227385
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| EXAMPLE
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Some solutions for n=4
..0..0..1..0....0..0..0..0....0..1..0..0....0..0..1..0....0..0..1..0
..1..0..0..1....0..1..0..0....1..0..0..1....0..1..0..1....1..0..0..0
..0..0..1..0....1..0..0..0....0..1..1..0....0..0..1..1....0..0..0..1
..0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..1....0..1..1..0
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| KEYWORD
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allocated
nonn
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| AUTHOR
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R. H. Hardin Jul 09 2013
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| STATUS
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approved
editing
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#2 by R. H. Hardin at Tue Jul 09 13:19:03 EDT 2013
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| KEYWORD
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allocating
allocated
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#1 by R. H. Hardin at Tue Jul 09 13:19:03 EDT 2013
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| NAME
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allocated for R. H. Hardin
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| KEYWORD
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allocating
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| STATUS
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approved
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