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

1,1

Comments

Column 6 of A224012

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)

Example

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

Crossrefs

Sequence in context: A223923 A224351 A224193 * A171302 A189901 A189907

Adjacent sequences: A224007 A224008 A224009 * A224011 A224012 A224013

Keyword

nonn

Author

R. H. Hardin Mar 30 2013

Status

approved