A302509 Number of n X n 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1, 3, 11, 28, 90, 458, 4558, 82857, 1748514, 44378638, 1537387012, 96444437992, 9693542232011, 1237134041433890, 196120841811367262, 47516901892945494991, 19045444458145286230306
Offset: 1
Keywords
Examples
Some solutions for n=5 ..0..1..0..1..0. .0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..1 ..0..0..1..1..0. .0..0..0..1..0. .0..1..0..1..0. .0..1..0..0..0 ..0..1..0..1..0. .0..1..1..1..0. .0..1..0..1..0. .0..1..1..1..0 ..0..1..0..1..0. .0..1..0..0..0. .0..0..0..1..0. .0..0..0..1..0 ..0..1..1..1..0. .0..1..0..1..0. .1..1..0..1..0. .0..1..0..1..0
Crossrefs
Cf. A302515.
Comments