A304150 Number of n X n 0..1 arrays with every element unequal to 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.

0, 3, 4, 346, 13279, 1100030, 217640633, 80851458613, 58581875264320

Offset

1,2

Comments

Diagonal of A304156.

Links

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

Example

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

Crossrefs

Cf. A304156.

Sequence in context: A195566 A348278 A348280 * A305505 A069970 A305169

Adjacent sequences: A304147 A304148 A304149 * A304151 A304152 A304153

Keyword

nonn

Author

R. H. Hardin, May 07 2018

Status

approved