A183692 Number of (n+1)X4 0..2 arrays with every 2X2 subblock nonsingular

1970, 66658, 2235330, 75166498, 2525447442, 84872526674, 2852069116186, 95843840904146, 3220808030907306, 108234716039535994, 3637206631307124730, 122227654071983980522, 4107437311725265473026, 138029661306117738496458

Offset

1,1

Comments

Column 3 of A183698

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=17*a(n-1)+526*a(n-2)+1525*a(n-3)-14279*a(n-4)-31924*a(n-5)+135724*a(n-6)+14896*a(n-7)-63104*a(n-8)

Example

Some solutions for 3X4
..0..2..2..0....1..0..1..2....0..2..0..2....2..2..1..1....0..2..2..1
..2..0..2..1....2..1..2..2....1..0..2..1....0..2..0..1....2..0..1..2
..1..1..1..1....2..0..1..2....1..2..1..0....1..0..2..0....2..1..0..2

Crossrefs

Sequence in context: A252012 A250804 A205210 * A206218 A255967 A153352

Adjacent sequences: A183689 A183690 A183691 * A183693 A183694 A183695

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved