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 A026113 #8 Sep 16 2019 21:35:36 %S A026113 1,2,15,112,879,7084,58123,482980,4051542,34236670,291001515, %T A026113 2485209984,21308128100,183304844334,1581390987039,13676468811804, %U A026113 118533903449357,1029280548493050,8952719328878815,77988115665259800,680280714418808610,5941248392350208706 %N A026113 T(3n,n), where T is the array defined in A026105. %Y A026113 Cf. A026105. %K A026113 nonn %O A026113 0,2 %A A026113 _Clark Kimberling_ %E A026113 a(13) corrected and more terms from _Sean A. Irvine_, Sep 16 2019