Satisfies A(x) = 1 + x*A(x)*f(x)^2, where f(x) = Sum_{k>=0} x^((3^n-1)/2) and f(x)^2 = 2 - f(x^2) + 2*Sum_{n>0} x^A023745(n).
A087218
Satisfies A(x) = 1 + x*A(x)*f(x)^2, where f(x) = Sum_{k>=0} x^((3^n-1)/2) and f(x)^2 = 2 - f(x^2) + 2*Sum_{n>0} x^A023745(n).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =13a(5) =30a(6) =66a(7) =147a(8) =327a(9) =726a(10) =1614a(11) =3588a(12) =7974a(13) =17725a(14) =39399a(15) =87573a(16) =194655a(17) =432669a(18) =961716a(19) =2137659a(20) =4751490a(21) =10561392a(22) =23475378a(23) =52179987a(24) =115983270a(25) =257802273a(26) =573031011a(27) =1273706934a(28) =2831137095a(29) =6292921101
External references
- oeis: A087218