A224009 Number of nX5 0..2 arrays with rows nondecreasing and antidiagonals unimodal

21, 441, 6815, 90051, 1108969, 13275381, 157347899, 1859567103, 21962353421, 259365424097, 3063049674271, 36174616727819, 427225636505145, 5045588330345405, 59589072289828011, 703755006991845799

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