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A201698 Number of nX6 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards 1
3, 48, 2068, 167625, 14268351, 795339012, 27102769900, 615440785548, 10106227864338, 127441635892627, 1290114077123683, 10846768837607450, 77797729805055016, 486398599750167133, 2697872438447793007 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A201700

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..90

FORMULA

Empirical: a(n) is a polynomial of degree 34

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A199012 A304208 A300871 * A295813 A326217 A003029

Adjacent sequences:  A201695 A201696 A201697 * A201699 A201700 A201701

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 03 2011

STATUS

approved

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Last modified September 21 22:12 EDT 2019. Contains 327284 sequences. (Running on oeis4.)