G.f.: Sum_{n>=0} x^n / Product_{k=1..2*n-1} (1 - k*x).
A229285
G.f.: Sum_{n>=0} x^n / Product_{k=1..2*n-1} (1 - k*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =42a(5) =260a(6) =1860a(7) =15020a(8) =134336a(9) =1313696a(10) =13911528a(11) =158279872a(12) =1922455440a(13) =24794405328a(14) =338037825952
External references
- oeis: A229285