

A269088


Number of nX7 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.


1



72, 1127, 18590, 268289, 3761534, 50865307, 673690710, 8768989835, 112658396453, 1431998499913, 18044145807959, 225714076389625, 2806025783464923, 34698719581599414, 427098528675334433, 5235801241750340793
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Empirical recurrence of order 68 (see link above)


EXAMPLE

Some solutions for n=3
..0..0..0..0..1..0..0. .1..0..0..0..0..1..0. .0..1..0..1..0..0..0
..0..0..0..0..0..1..1. .0..0..0..0..0..0..0. .0..0..1..0..1..0..0
..0..0..0..0..0..0..0. .1..0..0..0..1..0..0. .0..0..0..0..0..1..0


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



