A183704 Number of (n+1)X4 0..3 arrays with every 2X2 subblock nonsingular

31800, 4760784, 710460576, 106093597920, 15840740585184, 2365244332190880, 353161421431958880, 52731638795200916256, 7873523002759947918432, 1175620025708806400583456, 175535451188975807239481952

Offset

1,1

Comments

Column 3 of A183710

Links

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

Formula

Empirical: a(n)=86*a(n-1)+8599*a(n-2)+136224*a(n-3)-1175256*a(n-4)-18016864*a(n-5)+130578912*a(n-6)-84468528*a(n-7)-318225024*a(n-8)

Example

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

Crossrefs

Sequence in context: A206114 A252034 A284519 * A278013 A140939 A237165

Adjacent sequences: A183701 A183702 A183703 * A183705 A183706 A183707

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved