A224315 Number of 7Xn 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

2187, 419904, 4634768, 22071219, 80083648, 268379906, 911404794, 3202146197, 11485486125, 41212527412, 145413457614, 498294091308, 1645129036705, 5209884539118, 15798173688229, 45874155195909, 127717720870044

Offset: 1

Author

R. H. Hardin Apr 03 2013

Keywords

• nonn

Comments

Row 7 of A224310

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..1....0..0..0....0..0..1....0..0..0....0..0..2....0..1..1
..0..0..1....0..2..1....0..0..2....0..1..2....1..1..0....0..2..0....2..1..0
..0..2..0....2..2..2....0..2..2....2..2..1....1..0..0....2..2..0....1..0..0
..2..0..0....2..2..2....2..2..0....2..1..1....2..2..0....2..2..1....0..0..0
..1..0..0....2..2..0....2..1..0....2..1..0....2..0..0....2..1..0....1..0..0
..0..2..0....2..2..0....1..2..1....1..1..1....0..2..0....2..2..1....2..2..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..159
• R. H. Hardin, Empirical polynomial of degree 28

Formula

Empirical polynomial of degree 28 (see link above)