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.

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

Alois P. Heinz, Table of n, a(n) for n = 5..1000

Formula

a(n) = A293744(n) - A293743(n).

Crossrefs

Column k=5 of A293113.

Cf. A293743, A293744.

Sequence in context: A190065 A293068 A213294 * A132165 A200573 A224130

Adjacent sequences: A293883 A293884 A293885 * A293887 A293888 A293889

Keyword

nonn

Author

Alois P. Heinz, Oct 18 2017

Status

approved