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A224009 Number of nX5 0..2 arrays with rows nondecreasing and antidiagonals unimodal 1
21, 441, 6815, 90051, 1108969, 13275381, 157347899, 1859567103, 21962353421, 259365424097, 3063049674271, 36174616727819, 427225636505145, 5045588330345405, 59589072289828011, 703755006991845799 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A224012

LINKS

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

FORMULA

Empirical: a(n) = 21*a(n-1) -141*a(n-2) +427*a(n-3) -546*a(n-4) +526*a(n-5) -2124*a(n-6) +3302*a(n-7) +2396*a(n-8) +7504*a(n-9) +580*a(n-10) +1632*a(n-11)

EXAMPLE

Some solutions for n=3

..0..0..0..0..1....0..0..1..2..2....0..0..2..2..2....1..1..2..2..2

..1..1..1..2..2....0..1..2..2..2....0..1..1..1..2....1..1..1..1..2

..0..2..2..2..2....1..1..2..2..2....0..0..1..2..2....0..0..0..0..1

CROSSREFS

Sequence in context: A224192 A207184 A189060 * A167255 A171295 A009965

Adjacent sequences:  A224006 A224007 A224008 * A224010 A224011 A224012

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2013

STATUS

approved

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Last modified October 28 07:43 EDT 2021. Contains 348321 sequences. (Running on oeis4.)