A284328 Number of n X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

1, 4, 49, 5130, 1792007, 3063494246, 20513380740103, 582475612060753356

Offset

1,2

Comments

Diagonal of A284334.

Links

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

Example

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

Crossrefs

Cf. A284334.

Sequence in context: A068178 A050630 A080808 * A087588 A027533 A048559

Adjacent sequences: A284325 A284326 A284327 * A284329 A284330 A284331

Keyword

nonn

Author

R. H. Hardin, Mar 25 2017

Status

approved