a(0) = 1, a(n) = Sum_{k=1..n} stirling2(n,k) * k^(2*k).
A308490
a(0) = 1, a(n) = Sum_{k=1..n} stirling2(n,k) * k^(2*k).
Terms
- a(0) =1a(1) =1a(2) =17a(3) =778a(4) =70023a(5) =10439451a(6) =2327592658a(7) =725325847443
External references
- oeis: A308490