A233028 Number of (n+1)X(1+1) 0..3 arrays with row and column sums nondecreasing, and no adjacent elements equal

34, 96, 333, 912, 2874, 8070, 25028, 71492, 221072, 637090, 1967353, 5696300, 17569092, 51022742, 157190828, 457507314, 1408016908, 4105250676, 12622211969, 36855295684, 113218810762, 330996127114, 1016009702826, 2973522638274

Offset

1,1

Comments

Column 1 of A233031

Links

R. H. Hardin, Table of n, a(n) for n = 1..43

Example

Some solutions for n=5
..0..3....0..2....1..2....0..3....2..1....2..1....2..0....0..3....0..1....2..0
..3..0....2..1....2..1....1..2....1..3....1..2....0..2....3..0....1..0....1..2
..2..1....0..3....1..2....3..0....3..1....0..3....2..1....1..2....2..1....0..3
..0..3....1..2....0..3....0..3....1..3....2..1....1..2....2..1....1..2....1..2
..1..2....2..1....2..1....3..0....3..2....1..2....2..1....1..2....2..3....2..1
..2..3....1..3....3..0....1..2....2..3....0..3....0..3....2..1....3..2....0..3

Crossrefs

Sequence in context: A160062 A247218 A233031 * A044221 A044602 A159904

Adjacent sequences: A233025 A233026 A233027 * A233029 A233030 A233031

Keyword

nonn

Author

R. H. Hardin, Dec 03 2013

Status

approved