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 A298019 #8 Jan 16 2018 02:52:10 %S A298019 1,7,19,31,55,91,115,157,217,253,313,397,445,523,631,691,787,919,991, %T A298019 1105,1261,1345,1477,1657,1753,1903,2107,2215,2383,2611,2731,2917, %U A298019 3169,3301,3505,3781,3925,4147,4447,4603,4843,5167,5335,5593,5941,6121,6397,6769,6961,7255,7651,7855,8167,8587 %N A298019 Partial sums of A298016. %H A298019 Colin Barker, <a href="/A298019/b298019.txt">Table of n, a(n) for n = 0..1000</a> %H A298019 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,2,-2,0,-1,1). %F A298019 From _Colin Barker_, Jan 16 2018: (Start) %F A298019 G.f.: (1 + 6*x + 12*x^2 + 10*x^3 + 12*x^4 + 12*x^5 + x^6) / ((1 - x)^3*(1 + x + x^2)^2). %F A298019 a(n) = a(n-1) + 2*a(n-3) - 2*a(n-4) - a(n-6) + a(n-7) for n>6. %F A298019 (End) %o A298019 (PARI) Vec((1 + 6*x + 12*x^2 + 10*x^3 + 12*x^4 + 12*x^5 + x^6) / ((1 - x)^3*(1 + x + x^2)^2) + O(x^80)) \\ _Colin Barker_, Jan 16 2018 %Y A298019 Cf. A298016. %K A298019 nonn,easy %O A298019 0,2 %A A298019 Chaim Goodman-Strauss and _N. J. A. Sloane_, Jan 13 2018