A265886 Number of n X n 0..2 arrays with the sum of the absolute differences of each element with its horizontal and vertical neighbors equal to the number of neighbors.

3, 12, 68, 664, 13672, 560512, 51483264, 8726974464, 3316077264896, 2260633288966144, 3463290521072435200, 9453965541320232534016, 58047351977461819763589120, 633980080610711649347287646208

Offset

1,1

Comments

Diagonal of A265887.

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

Some solutions for n=4
..2..1..2..2....0..0..1..0....1..2..1..0....1..2..1..2....2..1..0..1
..1..2..0..0....2..2..0..1....2..1..2..1....0..1..2..1....1..2..1..2
..2..2..0..1....1..2..0..2....1..2..1..0....1..2..1..0....2..1..2..1
..0..0..1..2....0..1..0..2....0..1..0..1....2..1..0..1....1..2..1..2

Crossrefs

Cf. A265887.

Sequence in context: A058115 A101313 A257605 * A295762 A375811 A375807

Adjacent sequences: A265883 A265884 A265885 * A265887 A265888 A265889

Keyword

nonn

Author

R. H. Hardin, Dec 17 2015

Status

approved