A303955 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2 or 5 king-move adjacent elements, with upper left element zero.

1, 4, 11, 61, 480, 4645, 44492, 702361, 14109468, 304650192, 7364610974, 278434000222, 13220477918463, 731634405964583, 46466846105770369, 4048357298616866249, 456085181923327713731

Offset

1,2

Comments

Diagonal of A303961.

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Cf. A303961.

Sequence in context: A002831 A246598 A242749 * A114053 A266386 A134823

Adjacent sequences: A303952 A303953 A303954 * A303956 A303957 A303958

Keyword

nonn

Author

R. H. Hardin, May 03 2018

Status

approved