A224372 Number of nX6 0..2 arrays with rows unimodal and antidiagonals nondecreasing.

148, 4690, 80819, 1092281, 13831334, 174854516, 2231009824, 28645726612, 368818252942, 4752723627808, 61255849072312, 789494767364269, 10175118017926314, 131136401564099516, 1690070260377561269

Offset: 1

Author

R. H. Hardin Apr 05 2013

Keywords

• nonn

Comments

Column 6 of A224374

Examples

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

Links

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

Formula

Empirical: a(n) = 28*a(n-1) -283*a(n-2) +1386*a(n-3) -3562*a(n-4) +4940*a(n-5) -3840*a(n-6) -14256*a(n-7) +50007*a(n-8) -26386*a(n-9) +141154*a(n-10) +250789*a(n-11) +41356*a(n-12) +274344*a(n-13) +134400*a(n-14) for n>18