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 A114174 #3 Mar 30 2012 18:36:52 %S A114174 1,3,16,95,601,3951,26650,183043,1274080,8959268,63512890,453227590, %T A114174 3252065077,23443729683,169680654790,1232381601759,8977925594880, %U A114174 65579423363511,480162707557696,3523121247341469,25899477669429042 %N A114174 Central terms of triangle A114172 found in even-indexed rows. %Y A114174 Cf. A114172, A114173 (row sums), A114175 (row sums-square). %K A114174 nonn %O A114174 0,2 %A A114174 _Paul D. Hanna_, Nov 15 2005