a(n) = Sum_{k=1..n} (-1)^(n-k) * k^n * floor(n/k).
A308313
a(n) = Sum_{k=1..n} (-1)^(n-k) * k^n * floor(n/k).
Terms
- a(0) =1a(1) =2a(2) =22a(3) =203a(4) =2285a(5) =33855a(6) =609345a(7) =12420372a(8) =284964519a(9) =7347342215a(10) =209807114169
External references
- oeis: A308313