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 A055508 #3 Mar 30 2012 17:30:21 %S A055508 1,5,16,25,36,38,47,49,57,59,71,81,93,103,119,134,141,149,156,172,176, %T A055508 184,194,198,218,234,238,254,258,281,299,303,313,321,325,343,347,363, %U A055508 365,369,379,385,389,397,407,411,419,427,429,433,450,454,469,471,475 %N A055508 H is the first, fifth, sixteenth, ..., letter in the sequence not counting spaces and commas. %C A055508 Along with the letters "T" and "I", this completes the series, i.e. no other letters in the alphabet can substain a sequence with such a definition. %Y A055508 Cf. A005224 and A049525. %K A055508 easy,nonn,word %O A055508 1,2 %A A055508 _Robert G. Wilson v_, Jun 29 2000