a(n) = coefficient of x^n in the n-th iteration of (x + x^2 + x^3) for n>=1.

A166882

a(n) = coefficient of x^n in the n-th iteration of (x + x^2 + x^3) for n>=1.

Terms

    a(0) =1a(1) =2a(2) =9a(3) =60a(4) =560a(5) =6720a(6) =98826a(7) =1722084a(8) =34700940a(9) =793894860a(10) =20329008975a(11) =576026191026

External references