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, 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

Links

Table of n, a(n) for n=0..26.

Crossrefs

Column k=5 of A240608.

Sequence in context: A149897 A124527 A149898 * A240612 A240613 A240614

Adjacent sequences: A240608 A240609 A240610 * A240612 A240613 A240614

Keyword

nonn

Author

Alois P. Heinz, Apr 09 2014

Status

approved