G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (2*k-1) / (1 + k*(2*k-1)*x).
A221972
G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (2*k-1) / (1 + k*(2*k-1)*x).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =49a(4) =797a(5) =19417a(6) =661829a(7) =30067105a(8) =1755847661a(9) =128153307433
External references
- oeis: A221972