A320216 Number of multisets of nonempty words with a total of n letters over senary alphabet such that all letters occur at least once in the multiset.

4051, 114402, 1918083, 24917060, 277491084, 2788377264, 26047147641, 230519395506, 1957678084920, 16097696173138, 129006208397535, 1012503732847524, 7811457988379140, 59410698772806630, 446452429135687776, 3320813986603421328, 24485059125388934799

Offset: 6

Author

Alois P. Heinz, Oct 07 2018

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 6..1000

Crossrefs

Column k=6 of A257740.

Cf. A320207.

Programs

Maple

b:= proc(n, k) option remember; `if`(n=0, 1, add(add(
      d*k^d, d=numtheory[divisors](j))*b(n-j, k), j=1..n)/n)
    end:
a:= n-> (k-> add(b(n, k-i)*(-1)^i*binomial(k, i), i=0..k))(6):
seq(a(n), n=6..25);