a(n) = Sum_{k=0..n} C(n,k)*Stirling2(n,k)^2.
A047798
a(n) = Sum_{k=0..n} C(n,k)*Stirling2(n,k)^2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =31a(4) =443a(5) =9006a(6) =241147a(7) =7956579a(8) =318973867a(9) =15061651528a(10) =824029357046
External references
- oeis: A047798