A269195 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three no more than once.

4, 180, 25572, 15289548, 34838403756, 320994710282892, 12093315071771856492, 1887658657444603460395332, 1230222115345954315761363474780, 3366670969596963372379333414861881876

Offset

1,1

Comments

Diagonal of A269201.

Links

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

Example

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

Crossrefs

Cf. A269201.

Sequence in context: A176351 A330771 A263436 * A269102 A240282 A278693

Adjacent sequences: A269192 A269193 A269194 * A269196 A269197 A269198

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved