A204304 Number of (n+1)X3 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards

2400, 51680, 1077978, 15057392, 209106648, 2204400210, 23201606946, 200331995906, 1728110340165, 12862271960318, 95648326774567, 635215735696824, 4214888076792290, 25594741730037564, 155297247712997472

Offset

1,1

Comments

Column 2 of A204309

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..1..0....2..3..1....3..1..1....1..1..3....1..0..2....0..1..1....2..3..2
..2..2..2....1..1..3....0..3..2....0..1..0....0..1..2....1..1..2....1..1..1
..0..3..1....3..3..1....3..3..1....0..2..2....1..3..0....1..2..3....3..3..3
..1..3..1....0..2..2....0..3..2....0..1..1....0..1..3....0..2..2....1..1..1
..0..3..2....3..3..3....3..3..1....3..3..2....2..2..1....0..3..2....3..3..3

Crossrefs

Sequence in context: A233880 A234453 A236084 * A235414 A235259 A321638

Adjacent sequences: A204301 A204302 A204303 * A204305 A204306 A204307

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved