G.f.: Sum_{n>=0} x^n*Product_{k=1..n} (1 - (2*k-1)*x) / (1 - (2*k)*x).
A193318
G.f.: Sum_{n>=0} x^n*Product_{k=1..n} (1 - (2*k-1)*x) / (1 - (2*k)*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =54a(6) =229a(7) =1111a(8) =6020a(9) =35873a(10) =232677a(11) =1629528a(12) =12238621a(13) =98006533a(14) =832764146a(15) =7477375601a(16) =70696248123a(17) =701636328534
External references
- oeis: A193318