G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(2n-1))...)^5)^3)^1.
A138211
G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(2n-1))...)^5)^3)^1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =18a(5) =166a(6) =2070a(7) =32505a(8) =614918a(9) =13600671a(10) =344202033a(11) =9806468970a(12) =310553772735
External references
- oeis: A138211