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A293886
Number of sets of nonempty words with a total of n letters over quinary alphabet containing the fifth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
2
1, 6, 36, 172, 813, 3576, 15647, 66493, 282063, 1181554, 4951592, 20648077, 86254964, 359920291, 1505749933, 6305449303, 26485669295, 111485395542, 470834817242, 1993891398761, 8472782274541, 36113575773694, 154458283438023, 662716935400473, 2853093892389838
OFFSET
5,2
LINKS
FORMULA
a(n) = A293744(n) - A293743(n).
CROSSREFS
Column k=5 of A293113.
Sequence in context: A190065 A293068 A213294 * A132165 A200573 A224130
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 18 2017
STATUS
approved