G.f.: 1+x = Sum_{n>=0} a(n) * x^n * Product_{k=1..n} (1 - k*x)/(1 + k*x).
A208833
G.f.: 1+x = Sum_{n>=0} a(n) * x^n * Product_{k=1..n} (1 - k*x)/(1 + k*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =10a(4) =86a(5) =1082a(6) =18202a(7) =386834a(8) =9990206a(9) =304821826a(10) =10757265314a(11) =431846459786
External references
- oeis: A208833