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A201980 Number of nX7 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards 0
4, 420, 301612, 729771318, 1706069013928, 2238761872232964, 1716349328902123738 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A201981

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=2

..3..3..3..3..3..3..3....0..0..2..2..2..2..3....1..1..1..1..1..2..3

..3..3..3..3..3..3..3....2..2..1..1..1..1..0....2..2..2..2..2..1..0

CROSSREFS

Sequence in context: A215647 A228242 A036771 * A080321 A264469 A172858

Adjacent sequences:  A201977 A201978 A201979 * A201981 A201982 A201983

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 07 2011

STATUS

approved

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Last modified November 17 18:24 EST 2018. Contains 317276 sequences. (Running on oeis4.)