A293094 Number of n X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 two less than the number of 0's adjacent to some 1.

0, 0, 48, 8088, 3125547, 5589631828, 38469698642410, 1110306381675662688

Offset

1,3

Comments

Diagonal of A293100.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Cf. A293100.

Sequence in context: A130417 A299943 A226257 * A233199 A232160 A260212

Adjacent sequences: A293091 A293092 A293093 * A293095 A293096 A293097

Keyword

nonn

Author

R. H. Hardin, Sep 30 2017

Status

approved