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A303450
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 232, 22756, 7626768, 8727953509, 34135836415352, 456007654163072581, 20805454795028528642228
OFFSET
1,2
COMMENTS
Diagonal of A303456.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..1..1..1. .0..0..0..1..0. .0..0..0..0..1. .0..0..1..0..0
..1..0..1..1..0. .0..1..0..1..1. .1..0..1..0..1. .0..0..1..1..1
..1..0..0..1..1. .1..1..0..0..0. .1..0..1..0..1. .1..0..0..1..1
..1..1..1..1..1. .0..0..1..1..1. .1..1..0..0..0. .1..0..1..0..0
CROSSREFS
Cf. A303456.
Sequence in context: A240299 A222525 A214351 * A301437 A111836 A288546
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 24 2018
STATUS
approved