A166999 a(n) = a(n-1) + a(n-1)^2 + a(n-1)^3 for n>0 with a(0)=1.

1, 3, 39, 60879, 225636660844959, 11487591726386681145142587842614325062822719

Offset: 0

Author

Paul D. Hanna, Nov 21 2009

Keywords

• nonn

Crossrefs

Cf. A166880.

Programs

Mathematica

NestList[#+#^2+#^3&,1,5] (* Harvey P. Dale, Sep 22 2024 *)

PARI

a(n)=if(n==0,1,a(n-1)+a(n-1)^2+a(n-1)^3)

Formula

Row sums of triangle A166880, which lists the coefficients in the iterations of x+x^2+x^3.