A223981 Number of n X n 0..3 arrays with rows unimodal and columns nondecreasing

4, 100, 5029, 358118, 31831914, 3322756326, 392525216516, 51162688962195, 7224066705841458, 1089938030989276020, 173886286002145386302, 29095306392044768817550, 5072863442986308208335738

Offset

1,1

Comments

Diagonal of A223987

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Sequence in context: A266524 A224167 A223858 * A224385 A249939 A224018

Adjacent sequences: A223978 A223979 A223980 * A223982 A223983 A223984

Keyword

nonn

Author

R. H. Hardin Mar 30 2013

Status

approved