a(n) = Sum_{q=0..n} Stirling2(n+1,q)^2*q!.
A111420
a(n) = Sum_{q=0..n} Stirling2(n+1,q)^2*q!.
Terms
- a(0) =0a(1) =1a(2) =19a(3) =315a(4) =6601a(5) =178923a(6) =6161065a(7) =262268499a(8) =13470911521a(9) =818285112123
External references
- oeis: A111420