G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^(2*k-1) - 1)/(1 - x^(2*k-1)).
A207654
G.f.: Sum_{n>=0} Product_{k=1..n} ((1+x)^(2*k-1) - 1)/(1 - x^(2*k-1)).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =22a(4) =173a(5) =1816a(6) =23659a(7) =367573a(8) =6622465a(9) =135637477a(10) =3111148862a(11) =78984029782
External references
- oeis: A207654