a(n) = Sum_{i=1..n-1} (i^3 * a(i)), a(1)=1.
A256019
a(n) = Sum_{i=1..n-1} (i^3 * a(i)), a(1)=1.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =252a(4) =16380a(5) =2063880a(6) =447861960a(7) =154064514240
External references
- oeis: A256019
A256019
a(n) = Sum_{i=1..n-1} (i^3 * a(i)), a(1)=1.