

A224010


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


1



28, 784, 15340, 245055, 3516324, 47735665, 630339756, 8213689391, 106375878027, 1373916879120, 17723771318006, 228519337975633, 2945698436819118, 37967141667302902, 489335430219899681, 6306607945054850639
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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(n1) 283*a(n2) +1386*a(n3) 3562*a(n4) +4940*a(n5) 3840*a(n6) 14256*a(n7) +50007*a(n8) 26386*a(n9) +141154*a(n10) +250789*a(n11) +41356*a(n12) +274344*a(n13) +134400*a(n14)


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



