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A213872
Number of words w where each letter of the 10-ary alphabet occurs n times and for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.
1
1, 3628800, 654729075, 89575852312675, 140633739174235040170, 961415357313559098150122721, 18131599140232990157442722880124741, 725168149513389307543056971716033431701831, 51960277212541922189750307005207837858451630919380
OFFSET
0,2
EXAMPLE
a(0) = 1: the empty word.
a(1) = 3628800: all permutations of 10 letters.
CROSSREFS
Column k=10 of A213275.
Sequence in context: A133132 A228913 A179065 * A227672 A172540 A071552
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jun 23 2012
STATUS
approved