G.f.: A(x) = exp( Sum_{n>=1} G_n(x^n)^2 * x^n/n ) such that G_n(x^n) = Product_{k=0..n-1} A(u^k*x) where u is an n-th root of unity.
A203266
G.f.: A(x) = exp( Sum_{n>=1} G_n(x^n)^2 * x^n/n ) such that G_n(x^n) = Product_{k=0..n-1} A(u^k*x) where u is an n-th root of unity.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =43a(5) =172a(6) =852a(7) =3719a(8) =19290a(9) =90469a(10) =481825a(11) =2295973a(12) =12812880a(13) =62122518a(14) =346770241a(15) =1744884177a(16) =9830723932a(17) =49268101457a(18) =285020577850
External references
- oeis: A203266