A183641 Number of (n+1)X9 0..3 arrays with every 2x2 subblock summing to 6

302536, 386404, 563416, 945364, 1793416, 3743524, 8411896, 20077684, 50494696

Offset

1,1

Comments

Column 8 of A183642

Links

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

Formula

Empirical: a(n)=10*a(n-1)-35*a(n-2)+50*a(n-3)-24*a(n-4)

Example

Some solutions for 3X9
..2..0..2..2..0..0..3..0..2....0..2..3..0..3..0..2..2..3
..1..3..1..1..3..3..0..3..1....3..1..0..3..0..3..1..1..0
..2..0..2..2..0..0..3..0..2....0..2..3..0..3..0..2..2..3

Crossrefs

Sequence in context: A156998 A156999 A111031 * A212230 A185852 A053849

Adjacent sequences: A183638 A183639 A183640 * A183642 A183643 A183644

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved