A233029 Number of (n+1)X(2+1) 0..3 arrays with row and column sums nondecreasing, and no adjacent elements equal.

96, 642, 3132, 16296, 77353, 337570, 1459711, 6131600, 25014797, 100647020, 399073108, 1561490768, 6050110218, 23239177456, 88590795541, 335553550058, 1263942149575, 4737487677280, 17680474805387, 65735112648424

Offset

1,1

Comments

Column 2 of A233031

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Sequence in context: A183684 A251167 A251160 * A216106 A268795 A232405

Adjacent sequences: A233026 A233027 A233028 * A233030 A233031 A233032

Keyword

nonn

Author

R. H. Hardin, Dec 03 2013

Status

approved