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
Keywords
Examples
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
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)
Comments