A297971 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

0, 1, 8, 109, 18037, 5902043, 7833283900, 33544649054853, 475420963845148631

Offset

1,3

Comments

Diagonal of A297978.

Links

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

Example

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

Crossrefs

Cf. A297978.

Sequence in context: A309188 A371385 A098623 * A076151 A020560 A144813

Adjacent sequences: A297968 A297969 A297970 * A297972 A297973 A297974

Keyword

nonn

Author

R. H. Hardin, Jan 10 2018

Status

approved