A232916 Number of n X n 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally

3, 18, 246, 5808, 316800, 33994188, 8119777890, 3947661560964, 4209693243140760, 9272914213858594488, 44451105435218301006576, 443715189648501201190713852, 9592990624095118315413686008902, 434027944128749167232792242832245920

Offset

1,1

Comments

Diagonal of A232920

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

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

Crossrefs

Sequence in context: A137223 A159640 A038061 * A327231 A279490 A299431

Adjacent sequences: A232913 A232914 A232915 * A232917 A232918 A232919

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved