A268802 Number of n X n 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.

3, 34, 332, 5848, 195384, 12432856, 1508087180, 348686105792, 154172619407288, 130573457756588328, 212323461305457440492, 663970589813116610557692, 3999438097971983178736358520, 46462227980008803491191644654968

Offset

1,1

Comments

Diagonal of A268809.

Links

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

Example

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

Crossrefs

Cf. A268809.

Sequence in context: A024396 A246384 A066265 * A284891 A231593 A367509

Adjacent sequences: A268799 A268800 A268801 * A268803 A268804 A268805

Keyword

nonn

Author

R. H. Hardin, Feb 13 2016

Status

approved