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A172936 Number of 3*n X n 0..7 arrays with row sums 7 and column sums 21 1
1, 18152, 513799394688, 3453235602818369547520, 1835784677576057001102381224194900, 37246115504386074787217299933684238287194514560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n=1..10

CROSSREFS

Sequence in context: A251832 A250639 A205242 * A025029 A230948 A030331

Adjacent sequences: A172933 A172934 A172935 * A172937 A172938 A172939

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

STATUS

approved

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Last modified March 21 14:15 EDT 2023. Contains 361408 sequences. (Running on oeis4.)