A269090 Number of n X n 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once.

0, 96, 31296, 37963968, 211625837280, 5826856525990272, 819944297332124826720, 600994567853371717147309536, 2321584677123190401202986846749664, 47631920426007575412576023256743509016160

Offset

1,2

Comments

Diagonal of A269097.

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Cf. A269097.

Sequence in context: A208794 A276099 A233161 * A232522 A296061 A340396

Adjacent sequences: A269087 A269088 A269089 * A269091 A269092 A269093

Keyword

nonn

Author

R. H. Hardin, Feb 19 2016

Status

approved