A201698 - OEIS

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A201698

Number of nX6 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards

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