A318424 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 5, 36, 889, 19645, 1216538, 99435165, 16560787736, 4592429086849, 2333365855609501, 2101260262723993958

Offset

1,2

Comments

Diagonal of A318430.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A318430.

Sequence in context: A252782 A292194 A118018 * A156355 A002666 A222592

Adjacent sequences: A318421 A318422 A318423 * A318425 A318426 A318427

Keyword

nonn

Author

R. H. Hardin, Aug 26 2018

Status

approved