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 A031325 #4 Mar 30 2012 18:56:23 %S A031325 27,48,69,99,101,114,125,141,155,170,183,206,209,219,223,232,241,246, %T A031325 261,272,276,280,283,293,294,373,376,383,384,391,394,398,406,424,432, %U A031325 435,437,452,466,467,480,494,507,509,512,518 %N A031325 Position of n-th 0 in A031324. %K A031325 nonn %O A031325 1,1 %A A031325 _Clark Kimberling_