A183701 Number of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock nonsingular.

192, 108624, 710460576, 53961750797424, 47524363124861668992, 485531851352905710505726272, 57535515249805594625825370853448832

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Diagonal of A183710.

Sequence in context: A299993 A208444 A146554 * A208795 A203490 A008698

Adjacent sequences: A183698 A183699 A183700 * A183702 A183703 A183704

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved