A289644 Number of n X n 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.

0, 2, 61, 8554, 2662095, 5675111511, 35072966294346, 1096128160677176696, 121691314711314375091217

Offset

1,2

Comments

Diagonal of A289651.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A289651.

Sequence in context: A065589 A190681 A181005 * A347606 A094478 A273090

Adjacent sequences: A289641 A289642 A289643 * A289645 A289646 A289647

Keyword

nonn

Author

R. H. Hardin, Jul 09 2017

Status

approved