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A172834 Number of 3*n X n 0..4 arrays with row sums 7 and column sums 21 1
0, 20, 2332105236, 55821470965449838000, 73884729561168010198433552532700, 2932027248013823224822937070664663188676388640, 2229074240908452234163017626536657006251051388006192816445889 (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: A128671 A172766 A048948 * A271976 A182370 A259331

Adjacent sequences:  A172831 A172832 A172833 * A172835 A172836 A172837

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2010

STATUS

approved

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)