A270110 - OEIS

A270110

Number of n X n 0..7 arrays with some element plus some horizontally or vertically adjacent neighbor totalling seven exactly once.

0, 1344, 45440640, 38799000374400, 1043364062813432764992, 953623090124975369688224358912, 30710864722727618437291310619830386096704

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OFFSET

1,2

COMMENTS

Diagonal of A270118.

LINKS

EXAMPLE

Some solutions for n=2

..5..2. .0..2. .0..0. .7..3. .5..1. .5..2. .4..5. .2..1. .7..5. .0..6

..5..1. .6..5. .7..5. .4..3. .2..7. .3..1. .0..2. .5..0. .0..3. .7..7

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 11 2016

STATUS

approved