Number of sets of nonempty words with a total of n letters over ternary alphabet such that all letters occur at least once in the set.

A320204

Number of sets of nonempty words with a total of n letters over ternary alphabet such that all letters occur at least once in the set.

Terms

    a(0) =13a(1) =105a(2) =588a(3) =2811a(4) =12354a(5) =51543a(6) =207846a(7) =818241a(8) =3165036a(9) =12078462a(10) =45602379a(11) =170665569a(12) =633997185a(13) =2340201492a(14) =8589679914a(15) =31370151073a(16) =114045173001a(17) =412880470680

External references