A267992 Number of 3Xn arrays containing n copies of 0..3-1 with row sums and column sums nondecreasing.

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

R. H. Hardin, Table of n, a(n) for n = 1..30

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: A301866 A101645 A230692 * A060493 A198183 A259493

Adjacent sequences: A267989 A267990 A267991 * A267993 A267994 A267995

Keyword

nonn

Author

R. H. Hardin, Jan 23 2016

Status

approved