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A302674
Number of n X n 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
1, 3, 8, 20, 63, 453, 6311, 92889, 1847358, 65801890, 3339677315, 218906752065, 21593578996507, 3271858745091063, 693762002728416501, 208397398216895893003, 93110263365139995537485
OFFSET
1,2
COMMENTS
Diagonal of A302680.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..0..0. .0..0..0..1..0. .0..1..1..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..0..0. .0..1..0..1..0
..0..1..0..0..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
CROSSREFS
Cf. A302680.
Sequence in context: A268042 A009436 A354519 * A108189 A148768 A110861
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 11 2018
STATUS
approved