A316947 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 7, 160, 18956, 8641499, 15440641209, 109086632521219, 3041266904462686586, 334635446051408230633599, 145323559617043972823631878181, 249082491936418607489659470348823605

Offset

1,2

Comments

Diagonal of A316953.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Cf. A316953.

Sequence in context: A177779 A177469 A121786 * A083153 A320337 A214350

Adjacent sequences: A316944 A316945 A316946 * A316948 A316949 A316950

Keyword

nonn

Author

R. H. Hardin, Jul 17 2018

Status

approved