A304591 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.

0, 7, 82, 3789, 316549, 57480334, 23762003978, 21969407257111, 43780987662816536

Offset

1,2

Comments

Diagonal of A304597.

Links

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

Example

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

Crossrefs

Cf. A304597.

Sequence in context: A242375 A333984 A244821 * A139951 A141872 A089342

Adjacent sequences: A304588 A304589 A304590 * A304592 A304593 A304594

Keyword

nonn

Author

R. H. Hardin, May 15 2018

Status

approved