A186132 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace

81, 7686, 3090564, 5108761008, 35143110551556, 1006890732907711236, 120347170141816347874560, 60068131623385389414240300432

Offset

1,1

Comments

Diagonal of A186141

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 3X3
..2..1..1....1..1..2....0..2..0....1..2..0....1..0..0....1..2..0....2..0..2
..0..2..0....2..1..0....0..2..1....2..2..0....0..2..2....0..1..1....2..1..2
..0..0..1....2..2..1....0..1..2....2..2..1....1..0..2....1..0..1....0..0..0

Crossrefs

Sequence in context: A222441 A206216 A205056 * A206504 A046172 A123847

Adjacent sequences: A186129 A186130 A186131 * A186133 A186134 A186135

Keyword

nonn

Author

R. H. Hardin Feb 13 2011

Status

approved