A268767 Number of n X n 0..2 arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 12, 112, 2296, 64112, 3104544, 255353744, 36091542548, 8990276037592, 3911658481295924, 3022669494445395808, 4128305052223833006600, 10045914708457218016317000, 43496963453603913793217952196

Offset

1,2

Comments

Diagonal of A268774.

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

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

Crossrefs

Cf. A268774.

Sequence in context: A089700 A366716 A290742 * A221368 A083767 A285154

Adjacent sequences: A268764 A268765 A268766 * A268768 A268769 A268770

Keyword

nonn

Author

R. H. Hardin, Feb 13 2016

Status

approved