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 A026292 #7 Sep 24 2019 21:19:42 %S A026292 1,1,5,27,145,796,4438,25034,142479,816620,4706977,27256963,158450461, %T A026292 924129535,5404960900,31689099660,186188338689,1096001511849, %U A026292 6462416487070,38161656273410,225653893420214,1335936968552131,7917871096128978,46975164555309282,278951672249192025 %N A026292 a(n) = T(2n,n), where T is the array in A026268. %K A026292 nonn %O A026292 0,3 %A A026292 _Clark Kimberling_ %E A026292 Corrected and extended by _Sean A. Irvine_, Sep 24 2019