A269069 Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

2, 11, 123, 3288, 165607, 18220241, 4064720816, 1833956006577, 1778703508587227, 3374673365461249568, 14101540722268888633757, 114651904507399541002097761, 2060026489521744559823250922304, 72580676762280474254836112626897875

Offset

1,1

Comments

Diagonal of A269075.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Cf. A269075.

Sequence in context: A155928 A001946 A121337 * A361036 A224366 A342357

Adjacent sequences: A269066 A269067 A269068 * A269070 A269071 A269072

Keyword

nonn

Author

R. H. Hardin, Feb 19 2016

Status

approved