G.f. satisfies A(x) = (1 + x*A(x)) * (1 + x*A(x)^3).
A198953
G.f. satisfies A(x) = (1 + x*A(x)) * (1 + x*A(x)^3).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =56a(4) =400a(5) =3095a(6) =25240a(7) =213633a(8) =1859006a(9) =16527544a(10) =149472480a(11) =1370794835a(12) =12718060947a(13) =119158146283
External references
- oeis: A198953