A233405 Number of (n+1)X(4+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal

24, 100, 360, 1907, 6931, 21765, 86233, 274628, 965494, 3146010, 10444724, 33097949, 108522965, 338311791, 1086568168, 3360254074, 10607088651, 32550672493, 101662193862

Offset

1,1

Comments

Column 4 of A233408

Links

Table of n, a(n) for n=1..19.

Example

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

Crossrefs

Sequence in context: A042126 A157514 A100152 * A297798 A048529 A213842

Adjacent sequences: A233402 A233403 A233404 * A233406 A233407 A233408

Keyword

nonn

Author

R. H. Hardin, Dec 09 2013

Status

approved