A183689 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock nonsingular

50, 4594, 2235330, 5848268518, 81648038954018, 6101430466182955346, 2437545227670570289677842, 5208444026905229671830632661366, 59514652522597099528978017843617001686

Offset

1,1

Comments

Diagonal of A183698

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A224111 A047683 A010564 * A248205 A174756 A231937

Adjacent sequences: A183686 A183687 A183688 * A183690 A183691 A183692

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved