A186626 Number of (n+2)X3 0..3 arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

262144, 9576448, 349839616, 12780078472, 351107784608, 9646003088512, 265005162695168, 6097375527142592, 140291562401607848, 3227900658811424387, 65768960528937396632, 1340052444690066421952, 27303769743019178665472

Offset

1,1

Comments

Column 1 of A186629

Links

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

Example

Some solutions for 4X3
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..0..1..0....2..2..3....0..3..3....2..2..1....0..0..3....0..0..0....0..1..0
..3..2..1....1..1..0....0..2..1....1..0..2....0..2..1....1..0..1....3..2..1
..3..3..1....2..3..2....3..1..3....2..0..2....1..2..0....2..2..0....1..3..0

Crossrefs

Sequence in context: A250868 A250861 A186629 * A016998 A017070 A017262

Adjacent sequences: A186623 A186624 A186625 * A186627 A186628 A186629

Keyword

nonn

Author

R. H. Hardin, Feb 24 2011

Status

approved