A296581 Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 0, 2 or 3 neighboring 1's.

2, 9, 83, 2458, 214830, 52756072, 39585589653, 84537581697810, 511595224386235896, 8854271989464391363762, 434511224471903201800210223

Offset

1,1

Comments

Diagonal of A296588.

Links

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

Example

Some solutions for n=4
..1..0..0..1. .1..1..0..1. .0..0..1..1. .1..0..0..0. .1..1..0..1
..0..0..0..0. .1..0..1..1. .0..0..1..0. .0..1..0..0. .1..0..1..1
..0..1..0..1. .0..0..0..0. .0..0..0..0. .1..1..0..1. .1..0..0..1
..1..1..0..0. .1..0..0..1. .0..1..0..0. .0..0..0..0. .1..1..1..1

Crossrefs

Cf. A296588.

Sequence in context: A113146 A323769 A354045 * A069234 A086929 A193466

Adjacent sequences: A296578 A296579 A296580 * A296582 A296583 A296584

Keyword

nonn

Author

R. H. Hardin, Dec 16 2017

Status

approved