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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
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A128671 A172766 A048948 * A271976 A182370 A259331
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 06 2010
STATUS
approved