A223992 Number of 7Xn 0..3 arrays with rows unimodal and columns nondecreasing

120, 14400, 922768, 37395816, 1067023886, 22985966340, 392525216516, 5508176253088, 65292420643662, 668174455857788, 6007915697153117, 48154648894009693, 348228115672689236, 2295175317417878268

Offset

1,1

Comments

Row 7 of A223987

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical polynomial of degree 42

Formula

Empirical polynomial of degree 42 (see link above)

Example

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

Crossrefs

Sequence in context: A224178 A223870 A224390 * A224023 A121012 A250511

Adjacent sequences: A223989 A223990 A223991 * A223993 A223994 A223995

Keyword

nonn

Author

R. H. Hardin Mar 30 2013

Status

approved