A227088 - OEIS

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A227088

Number of nX5 binary arrays indicating whether each 2X2 subblock of a larger binary array has lexicographically increasing rows and columns, for some larger (n+1)X6 binary array with rows and columns of the latter in lexicographically nondecreasing order

1

16, 122, 842, 5517, 34862, 210279, 1198995, 6435794, 32506602, 154792049, 697073117, 2979286263, 12129141182, 47200560835, 176145560948, 632250821238, 2188584143256, 7323870287583, 23744538586763, 74727529131117

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 5 of A227089

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 47

FORMULA

Empirical polynomial of degree 47 (see link above)

EXAMPLE

Some solutions for n=4

..0..0..1..0..0....0..1..0..1..0....1..0..0..0..0....0..1..1..0..0

..0..1..1..0..0....1..1..0..0..1....0..1..1..0..0....1..1..0..0..1

..1..1..0..0..0....1..0..1..0..0....0..0..0..1..1....0..0..0..0..0

..0..0..0..1..0....0..0..0..1..0....0..0..0..0..0....0..0..0..0..1

CROSSREFS

Sequence in context: A191484 A030508 A006215 * A060633 A125353 A126511

Adjacent sequences: A227085 A227086 A227087 * A227089 A227090 A227091

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 30 2013

STATUS

approved