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%I #16 Oct 02 2023 15:20:24
%S 1,4,8,8,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
%T 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
%U 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6
%N Expansion of (1 + x)*(1 + 2*x + 2*x^2 - 2*x^3) / (1 - x).
%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F a(n) = 6 for n >= 4.
%o (PARI) Vec((1 + x)*(1 + 2*x + 2*x^2 - 2*x^3) / (1 - x) + O(x^80)) \\ _Colin Barker_, Nov 21 2019
%Y Row 3 of array in A329504.
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_, Nov 20 2019
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