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 A026115 #8 Sep 16 2019 22:00:17 %S A026115 1,3,15,77,413,2266,12636,71290,405790,2325923,13406666,77632590, %T A026115 451270925,2631763500,15391191315,90230338449,530098757210, %U A026115 3120158068370,18395925762046,108621483748778,642235028537889,3801900814767378,22531392119093175,133663824177577317 %N A026115 a(n) = T(2n,n-1), where T is the array defined in A026105. %Y A026115 Cf. A026105. %K A026115 nonn %O A026115 1,2 %A A026115 _Clark Kimberling_ %E A026115 More terms from _Sean A. Irvine_, Sep 16 2019