A269187 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once.

4, 108, 9284, 2817548, 3159954052, 13377149358556, 217602949665911156, 13760950074226562086140, 3411379570274317633099847884, 3335382860394625859139269051079788

Offset

1,1

Comments

Diagonal of A269194.

Links

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

Example

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

Crossrefs

Cf. A269194.

Sequence in context: A090205 A061464 A107048 * A185702 A279046 A212803

Adjacent sequences: A269184 A269185 A269186 * A269188 A269189 A269190

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved