G.f.: Sum_{n>=0} x^n*Product_{k=1..n} (1 - k*x) / (1 - (2*k-1)*x).
A193320
G.f.: Sum_{n>=0} x^n*Product_{k=1..n} (1 - k*x) / (1 - (2*k-1)*x).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =7a(5) =31a(6) =158a(7) =907a(8) =5785a(9) =40496a(10) =307993a(11) =2524639a(12) =22158860a(13) =207111169a(14) =2051807533a(15) =21458470274a(16) =236087173027
External references
- oeis: A193320