G.f. A(x) satisfies A(x) = 1/( 1 - x * (1+x) * A(x) )^3.
A382885
G.f. A(x) satisfies A(x) = 1/( 1 - x * (1+x) * A(x) )^3.
Terms
- a(0) =1a(1) =3a(2) =18a(3) =121a(4) =900a(5) =7110a(6) =58598a(7) =498153a(8) =4336533a(9) =38463732a(10) =346368351a(11) =3158325168a(12) =29102914959a(13) =270582713670
External references
- oeis: A382885