A298127 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

0, 1, 4, 15, 2621, 285084, 76791444, 58599163176, 99650656591710, 437509891251025898

Offset

1,3

Comments

Diagonal of A298133.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A298133.

Sequence in context: A295231 A070037 A297859 * A220788 A330315 A061849

Adjacent sequences: A298124 A298125 A298126 * A298128 A298129 A298130

Keyword

nonn

Author

R. H. Hardin, Jan 13 2018

Status

approved