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A269069
Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.
1
2, 11, 123, 3288, 165607, 18220241, 4064720816, 1833956006577, 1778703508587227, 3374673365461249568, 14101540722268888633757, 114651904507399541002097761, 2060026489521744559823250922304, 72580676762280474254836112626897875
OFFSET
1,1
COMMENTS
Diagonal of A269075.
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..1. .0..0..1..0. .0..0..0..0. .0..0..1..0. .0..0..0..1
..0..0..0..1. .1..0..0..1. .1..0..0..0. .1..0..0..0. .1..0..0..1
..1..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..1..1. .1..0..0..0
..0..1..0..0. .0..0..0..0. .0..0..0..1. .1..0..0..0. .0..0..1..0
CROSSREFS
Cf. A269075.
Sequence in context: A155928 A001946 A121337 * A361036 A224366 A342357
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 19 2016
STATUS
approved