G.f.: Sum_{n>=0} Product_{k=1..n} (1 - (1-x)^k)/(1 - x^k).
A207651
G.f.: Sum_{n>=0} Product_{k=1..n} (1 - (1-x)^k)/(1 - x^k).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =83a(6) =323a(7) =1410a(8) =7062a(9) =39660a(10) =248287a(11) =1709505a(12) =12843315a(13) =104446836a(14) =913968191a(15) =8560027375a(16) =85427505885a(17) =904899664970
External references
- oeis: A207651