A303248 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 49, 1401, 106803, 19457754, 7600681910, 7516309079483, 16637614325062889

Offset

1,2

Comments

Diagonal of A303254.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A303254.

Sequence in context: A277497 A173174 A302466 * A369942 A187664 A380754

Adjacent sequences: A303245 A303246 A303247 * A303249 A303250 A303251

Keyword

nonn

Author

R. H. Hardin, Apr 20 2018

Status

approved