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, 3, 8, 20, 63, 453, 6311, 92889, 1847358, 65801890, 3339677315, 218906752065, 21593578996507, 3271858745091063, 693762002728416501, 208397398216895893003, 93110263365139995537485

Offset

1,2

Comments

Diagonal of A302680.

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

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

Adjacent sequences: A302671 A302672 A302673 * A302675 A302676 A302677

Keyword

nonn

Author

R. H. Hardin, Apr 11 2018

Status

approved