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A240611
Number of n-length words w over a 5-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, 164, 629, 2511, 10284, 42765, 179411, 757518, 3212026, 13672821, 58390509, 250183486, 1075280768, 4636221163, 20051763960, 86995226538, 378588153837, 1652550862097, 7234850625649, 31766225617819, 139871594177849, 617573798910950
OFFSET
0,3
CROSSREFS
Column k=5 of A240608.
Sequence in context: A149897 A124527 A149898 * A240612 A240613 A240614
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 09 2014
STATUS
approved