A329503 Expansion of g.f. (1+x)*(1+2*x+2*x^2)/(1-x).

1, 4, 8, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10

Offset: 0

Author

N. J. A. Sloane, Nov 19 2019

Keywords

• nonn
• easy
• changed

Links

• Index entries for linear recurrences with constant coefficients, signature (1).

Crossrefs

Row 5 of array in A329501.

Programs

PARI

Vec((1 + x)*(1 + 2*x + 2*x^2) / (1 - x) + O(x^80)) \\ Colin Barker, Nov 19 2019

Formula

a(n) = 10 for n >= 3.