A183633 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock summing to 6

44, 340, 2300, 14644, 90524, 551380, 3333500, 20077684

Offset

1,1

Comments

Diagonal of A183642

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A001689 A306937 A199828 * A200450 A024304 A190420

Adjacent sequences: A183630 A183631 A183632 * A183634 A183635 A183636

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved