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 A023901 #5 Mar 30 2012 17:20:42 %S A023901 0,4,6,-4,0,-2,14,-4,-12,-16,44,14,0,-66,6,28,102,-92,-38,-24,188,-84, %T A023901 -46,-226,300,108,96,-690,232,218,806,-996,-280,-438,2114,-652,-518, %U A023901 -2542,3282,616,1312,-6792,2322,1580,8538,-10714,-1974,-4514,21868,-7916,-3972,-27356,34556 %N A023901 Derivative of log of A002126. %K A023901 sign %O A023901 1,2 %A A023901 _Olivier Gérard_