G.f. satisfies: A(x) = (1 - 3*x*A(x))^2 * (4*A(x) - 3).
A231616
G.f. satisfies: A(x) = (1 - 3*x*A(x))^2 * (4*A(x) - 3).
Terms
- a(0) =1a(1) =2a(2) =17a(3) =166a(4) =1790a(5) =20604a(6) =248073a(7) =3086094a(8) =39356942a(9) =511795708a(10) =6760681466a(11) =90467976284
External references
- oeis: A231616