G.f. A(x) satisfies A(x) = (1 + x / (1 - x*A(x))^2)^3.
A365121
G.f. A(x) satisfies A(x) = (1 + x / (1 - x*A(x))^2)^3.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =40a(4) =192a(5) =993a(6) =5375a(7) =30081a(8) =172650a(9) =1010640a(10) =6010530a(11) =36214656a(12) =220590082a(13) =1356131892a(14) =8403647454a(15) =52436122717a(16) =329170499604
External references
- oeis: A365121