A295775 Number of n X n 0..1 arrays with each 1 adjacent to 0 or 2 king-move neighboring 1's.

2, 9, 56, 1059, 37897, 2602065, 409525082, 128171125105, 83333126432833, 114403160523019326, 323325261181740261922, 1905368274130445991781276

Offset

1,1

Comments

Diagonal of A295781.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A295781.

Sequence in context: A274393 A371196 A004103 * A223381 A175896 A175900

Adjacent sequences: A295772 A295773 A295774 * A295776 A295777 A295778

Keyword

nonn

Author

R. H. Hardin, Nov 27 2017

Status

approved