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A267992
Number of 3Xn arrays containing n copies of 0..3-1 with row sums and column sums nondecreasing.
1
1, 21, 145, 1122, 7886, 58446, 405196, 2865756, 19652430, 135666717, 917861737, 6247996468, 41874859669, 281884085368, 1877330322718, 12537690094009, 83063782595536, 551574419251898, 3639691674489757, 24059481994135080
OFFSET
1,2
COMMENTS
Row 3 of A267990.
LINKS
EXAMPLE
Some solutions for n=6
..1..0..1..0..0..1....0..1..1..2..1..0....0..2..0..0..1..2....0..1..2..0..0..0
..1..0..0..2..2..2....0..1..2..0..0..2....0..0..1..1..1..2....1..0..1..1..2..1
..0..2..1..1..2..2....2..1..0..1..2..2....1..0..1..2..2..2....2..2..0..2..1..2
CROSSREFS
Cf. A267990.
Sequence in context: A377166 A101645 A230692 * A060493 A198183 A259493
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 23 2016
STATUS
approved