A295545 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1's.

1, 5, 34, 598, 23315, 2094347, 434357928, 207301696580, 228110991493680, 578288109272844847, 3378456566297565709729

Offset

1,2

Comments

Diagonal of A295551.

Links

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

Example

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

Crossrefs

Cf. A295551.

Sequence in context: A130607 A211042 A086345 * A309534 A348375 A194687

Adjacent sequences: A295542 A295543 A295544 * A295546 A295547 A295548

Keyword

nonn

Author

R. H. Hardin, Nov 23 2017

Status

approved