A223924 Number of 7Xn 0..2 arrays with rows and antidiagonals unimodal and columns nondecreasing.
36, 1296, 26494, 359344, 3588729, 28247478, 183720802, 1022160764, 4994941017, 21887522070, 87447220301, 322906269126, 1114442061385, 3628609366226, 11233293675288, 33279853366178, 94865889314403, 261354658486111
Offset: 1
Keywords
Examples
Some solutions for n=3 ..0..0..0....1..0..0....0..0..0....1..0..0....1..0..0....0..0..0....0..0..0 ..0..0..0....1..0..0....1..0..0....1..0..0....1..0..0....0..1..0....1..0..0 ..0..1..0....1..1..0....1..0..0....1..0..0....2..0..0....0..1..1....1..0..0 ..1..1..0....1..2..0....1..0..0....1..0..0....2..0..0....1..1..1....1..0..0 ..1..1..0....2..2..1....2..0..0....1..0..0....2..0..0....1..1..2....2..2..1 ..2..1..0....2..2..1....2..1..0....2..2..0....2..1..1....1..1..2....2..2..1 ..2..2..1....2..2..2....2..2..1....2..2..2....2..2..2....1..2..2....2..2..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
- R. H. Hardin, Empirical polynomial of degree 28
Formula
Empirical polynomial of degree 28 (see link above)
Comments