G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^(2*k-1) - 1).
A207569
G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^(2*k-1) - 1).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =18a(4) =151a(5) =1640a(6) =21825a(7) =343763a(8) =6253234a(9) =128993019a(10) =2975165831a(11) =75866604098
External references
- oeis: A207569