a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} (-1)^(k/d+1) * d )/(k * (n-k)!).
A354507
a(n) = n! * Sum_{k=1..n} ( Sum_{d|k} (-1)^(k/d+1) * d )/(k * (n-k)!).
Terms
- a(0) =1a(1) =3a(2) =14a(3) =48a(4) =269a(5) =1615a(6) =12662a(7) =73528a(8) =836817a(9) =8476243a(10) =99348534a(11) =948849176a(12) =13193115597a(13) =177346261391
External references
- oeis: A354507