A299815 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 39, 2101, 302780, 203062719, 506116118801, 4620961816405470, 155040688749828945595

Offset

1,2

Comments

Diagonal of A299821.

Links

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

Example

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

Crossrefs

Cf. A299821.

Sequence in context: A253920 A156378 A220061 * A371557 A222366 A029538

Adjacent sequences: A299812 A299813 A299814 * A299816 A299817 A299818

Keyword

nonn

Author

R. H. Hardin, Feb 19 2018

Status

approved