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A268760 Number of n X n binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 6, 56, 1148, 32056, 1552272, 127676872, 18045771274, 4495138018796, 1955829240647962, 1511334747222697904, 2064152526111916503300, 5022957354228609008158500, 21748481726801956896608976098 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A268766.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..26

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268766.

Sequence in context: A185524 A122743 A241031 * A137032 A053421 A083696

Adjacent sequences: A268757 A268758 A268759 * A268761 A268762 A268763

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2016

STATUS

approved

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Last modified February 5 20:57 EST 2023. Contains 360087 sequences. (Running on oeis4.)