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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
OFFSET
1,2
COMMENTS
Diagonal of A268766.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2016
STATUS
approved