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A201974 Number of n X n 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards 0
4, 30, 1372, 408599, 858105364, 13486744809160, 1716349328902123738 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A201981

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A064050 A162128 A234566 * A221250 A119926 A103307

Adjacent sequences:  A201971 A201972 A201973 * A201975 A201976 A201977

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 07 2011

STATUS

approved

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Last modified November 13 19:25 EST 2018. Contains 317149 sequences. (Running on oeis4.)