G.f. A(x) satisfies A(x) = (1 + x)^2 + x*A(x)^3 / (1 + x)^2.
A367640
G.f. A(x) satisfies A(x) = (1 + x)^2 + x*A(x)^3 / (1 + x)^2.
Terms
- a(0) =1a(1) =3a(2) =8a(3) =36a(4) =200a(5) =1220a(6) =7896a(7) =53220a(8) =369528a(9) =2624772a(10) =18981864a(11) =139287588a(12) =1034475624a(13) =7761249476a(14) =58735359032a(15) =447827171556
External references
- oeis: A367640