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 A022918 Multinomial coefficients(TOP, BOTTOM), where TOP = n(n+1)(2n+1)/6, BOTTOM = ( 1^2 2^2 ... n^2 ). 1
 1, 5, 10010, 1455680976750, 4492014649431378228480321000, 128588605335042465692190540763466217456052544386524000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..14 MAPLE with(combinat): a:= n-> multinomial(n*(n+1)*(2*n+1)/6, i^2\$i=1..n): seq(a(n), n=1..8);  # Alois P. Heinz, Sep 24 2013 CROSSREFS Sequence in context: A076629 A052027 A109514 * A212617 A160741 A101846 Adjacent sequences:  A022915 A022916 A022917 * A022919 A022920 A022921 KEYWORD nonn AUTHOR STATUS approved

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Last modified December 13 08:42 EST 2018. Contains 318082 sequences. (Running on oeis4.)