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A204304 Number of (n+1)X3 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards 1
2400, 51680, 1077978, 15057392, 209106648, 2204400210, 23201606946, 200331995906, 1728110340165, 12862271960318, 95648326774567, 635215735696824, 4214888076792290, 25594741730037564, 155297247712997472 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A204309
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 14 2012
STATUS
approved

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Last modified February 27 15:52 EST 2024. Contains 370377 sequences. (Running on oeis4.)