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A224130
Number of n X 5 0..1 arrays with rows nondecreasing and antidiagonals unimodal.
1
6, 36, 175, 760, 3149, 12874, 52581, 215136, 881461, 3613806, 14818385, 60762820, 249150689, 1021591594, 4188791861, 17175102296, 70422257341, 288749179526, 1183945486745, 4854479873580, 19904611911929, 81614010974114
OFFSET
1,1
COMMENTS
Column 5 of A224133.
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) - 9*a(n-2) + 4*a(n-3) + 2*a(n-4) + 8*a(n-5).
Empirical g.f.: x*(6 + 13*x^2 + 10*x^3 + 8*x^4) / (1 - 6*x + 9*x^2 - 4*x^3 - 2*x^4 - 8*x^5). - Colin Barker, Aug 27 2018
EXAMPLE
Some solutions for n=3:
..0..0..0..0..1....1..1..1..1..1....0..0..0..0..1....0..0..0..0..0
..0..0..0..0..1....1..1..1..1..1....0..0..1..1..1....1..1..1..1..1
..0..0..0..0..0....0..0..0..0..1....0..0..0..0..0....0..0..0..0..0
CROSSREFS
Cf. A224133.
Sequence in context: A293886 A132165 A200573 * A283197 A218265 A258629
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 31 2013
STATUS
approved