O.g.f.: exp( Integral Sum_{n>=1} (2*n)! * x^(n-1) / Product_{k=1..2*n} (1 - k*x) dx ).
A243509
O.g.f.: exp( Integral Sum_{n>=1} (2*n)! * x^(n-1) / Product_{k=1..2*n} (1 - k*x) dx ).
Terms
- a(0) =1a(1) =2a(2) =17a(3) =356a(4) =15050a(5) =1090340a(6) =120880118a(7) =19006269152
External references
- oeis: A243509