A298964 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

1, 8, 219, 21098, 6892031, 7785598672, 30241030285680, 403845370764198967, 18541589058526001745929

Offset

1,2

Comments

Diagonal of A298970.

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..0. .0..0..0..0..0
..0..1..1..0..1. .0..0..0..1..0. .0..0..1..1..0. .0..0..1..0..0
..0..0..1..0..0. .1..1..1..1..0. .1..1..0..1..0. .1..1..0..1..1
..1..0..0..0..1. .1..0..0..0..1. .1..1..1..1..1. .0..1..0..1..1
..1..1..1..1..0. .1..1..1..1..1. .0..1..0..0..1. .1..1..1..0..0

Crossrefs

Cf. A298970.

Sequence in context: A352471 A232157 A305517 * A298455 A055350 A183261

Adjacent sequences: A298961 A298962 A298963 * A298965 A298966 A298967

Keyword

nonn

Author

R. H. Hardin, Jan 30 2018

Status

approved