G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(-3n) )...)^-9)^-6)^-3.
A138209
G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(-3n) )...)^-9)^-6)^-3.
Terms
- a(0) =1a(1) =1a(2) =-3a(3) =24a(4) =-307a(5) =5367a(6) =-118836a(7) =3185098a(8) =-100249284a(9) =3625011513a(10) =-148109085520
External references
- oeis: A138209