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

Author

Alois P. Heinz, Oct 18 2017

Keywords

• nonn

Links

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

Crossrefs

Column k=5 of A293113.

Cf. A293743, A293744.

Formula

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