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 A048118 #6 Jul 13 2025 14:25:58 %S A048118 0,1,2,6,18,60,204,720,2580,9408,34668,129024,483672,1824768,6919752, %T A048118 26357976,100778472,386591304,1487221056,5735785176,22170562656, %U A048118 85866332760,333151068528,1294658562912,5038469947992,19634243736168 %N A048118 a(n)=T(2n+1,n+1), where T is given by A048113. %C A048118 Apparently A048117 shifted once right. - _R. J. Mathar_, Jul 13 2025 %K A048118 nonn %O A048118 0,3 %A A048118 _Clark Kimberling_