A224010 Number of nX6 0..2 arrays with rows nondecreasing and antidiagonals unimodal.

28, 784, 15340, 245055, 3516324, 47735665, 630339756, 8213689391, 106375878027, 1373916879120, 17723771318006, 228519337975633, 2945698436819118, 37967141667302902, 489335430219899681, 6306607945054850639

Offset: 1

Author

R. H. Hardin Mar 30 2013

Keywords

• nonn

Comments

Column 6 of A224012

Examples

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

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)