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A240616
Number of n-length words w over a 10-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.
1
1, 1, 2, 5, 14, 46, 165, 651, 2771, 12638, 61398, 315562, 1709960, 9723253, 57831688, 358445901, 2306799588, 15354546420, 105275618325, 740481162174, 5321875886529, 38940082552276, 289132258826130, 2172495189822333, 16480880960094288, 125993420982428718
OFFSET
0,3
CROSSREFS
Column k=10 of A240608.
Sequence in context: A240613 A240614 A240615 * A240617 A001680 A275424
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 09 2014
STATUS
approved