A250845 Number of (n+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction

100, 2457, 44797, 626416, 7134786, 69543783, 601566177, 4741091128, 34703305546, 239290928999, 1571038806045, 9901650019496, 60291096166330, 356456047451631, 2054525997174241, 11582011158980816, 64029681309724210, 347906811859565887

Offset

1,1

Comments

Diagonal of A250853

Links

R. H. Hardin, Table of n, a(n) for n = 1..32

Example

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

Crossrefs

Sequence in context: A114777 A128988 A075822 * A200937 A112889 A118490

Adjacent sequences: A250842 A250843 A250844 * A250846 A250847 A250848

Keyword

nonn

Author

R. H. Hardin, Nov 28 2014

Status

approved