a(n) = n! * Sum_{d in D(n+1)} (-1)^(d+1)*(n+1)/d, D(n) the divisors of n.
A265024
a(n) = n! * Sum_{d in D(n+1)} (-1)^(d+1)*(n+1)/d, D(n) the divisors of n.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =6a(4) =144a(5) =480a(6) =5760a(7) =5040a(8) =524160a(9) =2177280a(10) =43545600a(11) =159667200a(12) =6706022400a(13) =49816166400
External references
- oeis: A265024