G.f.: Sum_{n>=0} x^n / Product_{k=n..2*n-1} (1 - k*x).
A249636
G.f.: Sum_{n>=0} x^n / Product_{k=n..2*n-1} (1 - k*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =33a(5) =186a(6) =1213a(7) =8949a(8) =73300a(9) =657589a(10) =6396829a(11) =66936872a(12) =748528619a(13) =8896663389a(14) =111873459298
External references
- oeis: A249636