A184210 Number of (n+1)X3 0..3 arrays with every 2X2 subblock sum greater than 6

1036, 30994, 808007, 22249026, 601469417, 16373312263, 444611005885, 12084357225118, 328338345988788, 8922222967151091, 242440415275112112, 6587856407285676011, 179011367304571279881, 4864274276729176636103

Offset

1,1

Comments

Column 2 of A184217

Links

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

Formula

Empirical: a(n)=21*a(n-1)+243*a(n-2)-1800*a(n-3)-8335*a(n-4)+43037*a(n-5)+82290*a(n-6)-395548*a(n-7)-259095*a(n-8)+1530499*a(n-9)+86017*a(n-10)-2608822*a(n-11)+581376*a(n-12)+2049624*a(n-13)-748352*a(n-14)-707040*a(n-15)+310464*a(n-16)+86400*a(n-17)-41472*a(n-18)

Example

Some solutions for 5X3
..2..2..2....2..2..0....2..2..2....2..2..2....2..2..2....2..2..0....2..2..2
..2..2..3....2..2..3....2..2..2....2..2..3....2..2..3....2..2..3....2..2..1
..3..3..0....3..3..0....3..3..2....1..3..1....2..2..3....2..2..2....3..1..3
..1..3..2....3..3..2....1..3..1....2..2..3....1..3..3....0..3..1....2..3..3
..3..2..1....0..3..3....3..3..1....2..3..2....0..3..1....2..2..2....3..3..3

Crossrefs

Sequence in context: A025412 A025409 A043388 * A163559 A159052 A065572

Adjacent sequences: A184207 A184208 A184209 * A184211 A184212 A184213

Keyword

nonn

Author

R. H. Hardin Jan 10 2011

Status

approved