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A166999 a(n) = a(n-1) + a(n-1)^2 + a(n-1)^3 for n>0 with a(0)=1. 1
1, 3, 39, 60879, 225636660844959, 11487591726386681145142587842614325062822719 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..5.

FORMULA

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

PROG

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

CROSSREFS

Cf. A166880.

Sequence in context: A198411 A097421 A180418 * A319955 A317484 A196159

Adjacent sequences:  A166996 A166997 A166998 * A167000 A167001 A167002

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Nov 21 2009

STATUS

approved

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Last modified May 6 14:16 EDT 2021. Contains 343586 sequences. (Running on oeis4.)