G.f. satisfies A(x) = (1 + x*A(x)/(1 - x*A(x))^3)^3.
A365136
G.f. satisfies A(x) = (1 + x*A(x)/(1 - x*A(x))^3)^3.
Terms
- a(0) =1a(1) =3a(2) =21a(3) =172a(4) =1563a(5) =15141a(6) =153240a(7) =1601160a(8) =17140686a(9) =187026210a(10) =2072333697a(11) =23255417925a(12) =263757940688
External references
- oeis: A365136