This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A329503 #20 Sep 04 2025 08:40:47 %S A329503 1,4,8,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, %T A329503 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, %U A329503 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10 %N A329503 Expansion of g.f. (1+x)*(1+2*x+2*x^2)/(1-x). %H A329503 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1). %F A329503 a(n) = 10 for n >= 3. %o A329503 (PARI) Vec((1 + x)*(1 + 2*x + 2*x^2) / (1 - x) + O(x^80)) \\ _Colin Barker_, Nov 19 2019 %Y A329503 Row 5 of array in A329501. %K A329503 nonn,easy,changed %O A329503 0,2 %A A329503 _N. J. A. Sloane_, Nov 19 2019