a(n) = n! * Sum_{k=1..n} binomial(n,k)/k.
A103213
a(n) = n! * Sum_{k=1..n} binomial(n,k)/k.
Terms
- a(0) =1a(1) =5a(2) =29a(3) =206a(4) =1774a(5) =18204a(6) =218868a(7) =3036144a(8) =47928816a(9) =850514400a(10) =16783812000a(11) =364865040000
External references
- oeis: A103213