A269283 Number of n X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.

4, 216, 62748, 87559668, 598478857956, 20680187784811380, 3689070798270477232620, 3444847181845510308844394628, 16998439594375033474993893597991428

Offset

1,1

Comments

Diagonal of A269289.

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Cf. A269289.

Sequence in context: A338282 A281997 A276487 * A055627 A260619 A167888

Adjacent sequences: A269280 A269281 A269282 * A269284 A269285 A269286

Keyword

nonn

Author

R. H. Hardin, Feb 21 2016

Status

approved