A304051 Number of n X n 0..1 arrays with every element unequal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.

0, 3, 6, 26, 596, 3434, 77360, 4890117, 181435839, 30401698932

Offset

1,2

Comments

Diagonal of A304058.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A304058.

Sequence in context: A214309 A005646 A033194 * A128437 A200654 A208665

Adjacent sequences: A304048 A304049 A304050 * A304052 A304053 A304054

Keyword

nonn

Author

R. H. Hardin, May 05 2018

Status

approved