A295114 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 4 1's.

1, 5, 26, 326, 8257, 420519, 43655680, 9196006628, 3931962260999, 3413278465996124, 6014918791165296861, 21516997694119562490452, 156257115416099427263269042, 2303561969444050408142747347914

Offset

1,2

Comments

Diagonal of A295120.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A295120.

Sequence in context: A197784 A279738 A106296 * A060516 A077537 A140423

Adjacent sequences: A295111 A295112 A295113 * A295115 A295116 A295117

Keyword

nonn

Author

R. H. Hardin, Nov 15 2017

Status

approved