G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^k - 1)/(1 - x^k).
A207652
G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^k - 1)/(1 - x^k).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =45a(5) =249a(6) =1709a(7) =13912a(8) =131168a(9) =1402706a(10) =16757321a(11) =221018769a(12) =3188425939a(13) =49925523804a(14) =843121969923
External references
- oeis: A207652