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 A026868 #6 May 28 2021 13:25:12 %S A026868 1,10,67,380,1976,9771,46845,220232,1022498,4710021,21593848,98750485, %T A026868 451158834,2061525163,9429060852,43193760271,198255105055, %U A026868 912011899565,4205605922556,19442627224940,90115768761346,418762733418510 %N A026868 T(2n+1,n+4), T given by A026747. %Y A026868 Cf. A026747. %K A026868 nonn %O A026868 3,2 %A A026868 _Clark Kimberling_