A233404 Number of (n+1)X(3+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal

22, 35, 211, 360, 1461, 2543, 8732, 15431, 46953, 84143, 236070, 431533, 1139832, 2108530, 5322489, 9995589, 24398272, 46169416, 109661296, 209717615, 488266741, 937818172, 2145733905, 4151538574, 9381737335, 18189661542, 40631596581

Offset

1,1

Comments

Column 3 of A233408

Links

R. H. Hardin, Table of n, a(n) for n = 1..67

Example

Some solutions for n=5
..0..2..0..2....0..2..0..1....0..1..0..1....0..2..0..2....1..0..1..0
..1..0..2..1....1..0..2..0....1..0..2..0....1..0..2..1....0..1..0..2
..0..2..0..2....0..1..0..2....0..2..0..2....0..2..0..2....2..0..2..0
..2..0..2..0....2..0..2..1....2..0..2..1....2..0..2..1....0..2..0..2
..0..2..0..2....1..2..0..2....0..2..1..2....1..2..1..2....1..0..2..1
..1..0..2..1....2..1..2..1....2..1..2..1....2..1..2..1....0..2..1..2

Crossrefs

Sequence in context: A245365 A100039 A061561 * A167277 A084141 A259736

Adjacent sequences: A233401 A233402 A233403 * A233405 A233406 A233407

Keyword

nonn

Author

R. H. Hardin, Dec 09 2013

Status

approved