A318539 Number of n X n 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 1, 6, 31, 247, 2905, 46165, 1143583, 41368803, 2165406865, 168220637918, 19176703676628, 3204799103321623, 788247777299643666, 284810105663632654341, 151134158955831615046217

Offset

1,3

Comments

Diagonal of A318545.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

Some solutions for n=5
..0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..0..0..0. .1..0..0..0..0. .0..0..1..0..0. .0..0..0..1..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0
..0..1..0..0..1. .0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..0..0. .0..0..0..1..0. .0..0..0..1..0. .0..0..0..0..0

Crossrefs

Cf. A318545.

Sequence in context: A244255 A299550 A208594 * A221514 A144576 A120107

Adjacent sequences: A318536 A318537 A318538 * A318540 A318541 A318542

Keyword

nonn

Author

R. H. Hardin, Aug 28 2018

Status

approved