A329511 Expansion of (1 + x)*(1 + x^2)^2*(1 + x - x^3) / (1 - x).

1, 3, 6, 9, 11, 11, 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8

Offset: 0

Author

N. J. A. Sloane, Nov 22 2019

Keywords

• nonn
• easy

Links

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

Crossrefs

Row 4 of array in A329508.

Programs

PARI

Vec((1 + x)*(1 + x^2)^2*(1 + x - x^3) / (1 - x) + O(x^80)) \\ Colin Barker, Nov 23 2019

Formula

a(n) = 8 for n >= 8.