A295524 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1's.

1, 10, 147, 7071, 1012315, 437241277, 563330031268, 2154370064869978, 24591601562099287015, 837044464889796587986014, 84914857903369744218835564258

Offset

1,2

Comments

Diagonal of A295531.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A295531.

Sequence in context: A134526 A297714 A055761 * A095889 A097638 A178084

Adjacent sequences: A295521 A295522 A295523 * A295525 A295526 A295527

Keyword

nonn

Author

R. H. Hardin, Nov 23 2017

Status

approved