A269208 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

0, 96, 18048, 12548544, 30541426560, 292321215814512, 11273191243423937904, 1787171501783334054571344, 1177416215650225851496983234096, 3247635013385894059877839733594599296

Offset

1,2

Comments

Diagonal of A269214.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
..0..2..3. .3..0..0. .1..3..2. .2..0..0. .0..0..0. .1..2..2. .1..3..1
..0..2..2. .1..1..1. .2..2..2. .1..0..1. .0..1..3. .3..3..2. .1..3..3
..3..1..0. .3..3..1. .2..3..3. .0..3..2. .3..1..1. .2..3..2. .1..1..0

Crossrefs

Cf. A269214.

Sequence in context: A208443 A183418 A299950 * A295597 A203489 A208794

Adjacent sequences: A269205 A269206 A269207 * A269209 A269210 A269211

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved