A268897 Number of n X n 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

0, 36, 1584, 118584, 17194680, 5344944120, 3679171151832, 5729028666080112, 20420870331077074152, 167959998252207918469944, 3205098856567970748329302728, 142456755446316393140675874983544

Offset

1,2

Comments

Diagonal of A268904.

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

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

Crossrefs

Cf. A268904.

Sequence in context: A099366 A095657 A209014 * A034996 A166770 A270602

Adjacent sequences: A268894 A268895 A268896 * A268898 A268899 A268900

Keyword

nonn

Author

R. H. Hardin, Feb 15 2016

Status

approved