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A201979 Number of nX6 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards 1
4, 304, 117744, 91893727, 48452117136, 13486744809160, 2238761872232964, 248685266018356303, 19939344176339744246, 1214420344528171330419, 58291620982242700295226, 2267753515670520458933950 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A201981

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Sequence in context: A128904 A001537 A279576 * A280792 A027512 A153220

Adjacent sequences:  A201976 A201977 A201978 * A201980 A201981 A201982

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 07 2011

STATUS

approved

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Last modified November 12 21:10 EST 2018. Contains 317116 sequences. (Running on oeis4.)