A296629 Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 0, 2 or 4 neighboring 1's.

2, 8, 71, 1444, 67488, 7121315, 1700240351, 918770773688, 1123781080551251, 3111403698927107015, 19501463789775958005296, 276719237565795526825364758

Offset

1,1

Comments

Diagonal of A296635.

Links

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

Example

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

Crossrefs

Cf. A296635.

Sequence in context: A062733 A180687 A356811 * A026739 A060635 A364408

Adjacent sequences: A296626 A296627 A296628 * A296630 A296631 A296632

Keyword

nonn

Author

R. H. Hardin, Dec 17 2017

Status

approved