A224267 Number of 7 X n 0..2 arrays with rows, diagonals and antidiagonals unimodal and columns nondecreasing.

36, 1296, 24842, 296646, 2485967, 15921905, 83124099, 371699763, 1478187738, 5375576014, 18237850918, 58547208334, 179599458173, 530112786109, 1512954573026, 4190185564746, 11292006460221, 29674041029167, 76177448992499, 191331238729653, 470802086175412

Offset: 1

Author

R. H. Hardin, Apr 02 2013

Keywords

• nonn

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..41
• R. H. Hardin, Empirical polynomial of degree 28

Crossrefs

Row 7 of A224262.

Formula

Empirical polynomial of degree 28 (see link above).

Extensions

Name corrected by Andrew Howroyd, Mar 18 2025