A299931 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 4, 130, 11212, 3441754, 3664429516, 13409569414628, 169221841691644190, 7363533504405087088605

Offset

1,2

Comments

Diagonal of A299937.

Links

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

Example

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

Crossrefs

Cf. A299937.

Sequence in context: A050284 A096759 A299367 * A006103 A209012 A376870

Adjacent sequences: A299928 A299929 A299930 * A299932 A299933 A299934

Keyword

nonn

Author

R. H. Hardin, Feb 22 2018

Status

approved