a(n) = Sum_{k=1..n} k^2 * sigma_{n-2}(k).
A356243
a(n) = Sum_{k=1..n} k^2 * sigma_{n-2}(k).
Terms
- a(0) =1a(1) =9a(2) =49a(3) =447a(4) =4607a(5) =71009a(6) =1210855a(7) =24980627a(8) =575624572a(9) =14958422046a(10) =427890493960
External references
- oeis: A356243