G.f. A(x) satisfies A(x) = (1 + x)^3 * C(x*A(x)), where C(x) is the g.f. of A000108.
A381860
G.f. A(x) satisfies A(x) = (1 + x)^3 * C(x*A(x)), where C(x) is the g.f. of A000108.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =55a(4) =327a(5) =2157a(6) =15141a(7) =110853a(8) =836790a(9) =6465309a(10) =50876776a(11) =406335099a(12) =3285202335a(13) =26835060422a(14) =221128733649
External references
- oeis: A381860