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 A176593 #18 Oct 16 2019 11:28:12
%S A176593 1,13,2,26,3,39,4,52,5,65,6,78,7,91,8,104,9,117,10,130,11,143,12,156,
%T A176593 13,169,14,182,15,195,16,208,17,221,18,234,19,247,20,260,21,273,22,
%U A176593 286,23,299,24,312,25,325,26,338,27,351,28,364,29,377,30,390,31,403,32,416,33
%N A176593 List of pairs n,13*n.
%H A176593 Colin Barker, <a href="/A176593/b176593.txt">Table of n, a(n) for n = 1..1000</a>
%H A176593 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,2,0,-1).
%F A176593 a(n) = (14*n+12*n*(-1)^n+1 + (-1)^(n-1))/4 for n>1.
%F A176593 From _Colin Barker_, Jan 02 2017: (Start)
%F A176593 a(n) = 2*a(n-2) - a(n-4) for n>4.
%F A176593 G.f.: x*(1+13*x) / ((1-x)^2*(1+x)^2).
%F A176593 (End)
%t A176593 Table[{n,13n},{n,50}]//Flatten (* or *) LinearRecurrence[{0,2,0,-1},{1,13,2,26},100] (* _Harvey P. Dale_, Oct 16 2019 *)
%o A176593 (PARI) Vec(x*(1+13*x) / ((1-x)^2*(1+x)^2) + O(x^30)) \\ _Colin Barker_, Jan 02 2017
%Y A176593 Cf. A008595.
%K A176593 nonn,tabf,easy
%O A176593 1,2
%A A176593 _Vincenzo Librandi_, Apr 23 2010
%E A176593 Partially edited by _N. J. A. Sloane_, Jun 23 2010