a(n) = n!*Sum_{k=1..n} mu(k)/k!, where mu(k) is the Moebius function.
A068107
a(n) = n!*Sum_{k=1..n} mu(k)/k!, where mu(k) is the Moebius function.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =39a(5) =235a(6) =1644a(7) =13152a(8) =118368a(9) =1183681a(10) =13020490a(11) =156245880a(12) =2031196439a(13) =28436750147a(14) =426551252206
External references
- oeis: A068107