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 A247574 #7 Sep 20 2014 14:11:53 %S A247574 2,3,4,20,6,14,16,27,40,110,12,14,28,60,64,68,54,342,80 %N A247574 Base-13 state complexity of partitioned deterministic finite automaton (PDFA) for the periodic sequence (123...n)*. %H A247574 Klaus Sutner and Sam Tetruashvili, <a href="http://www.cs.cmu.edu/~sutner/papers/auto-seq.pdf">Inferring automatic sequences</a> (see table on the p. 5). %Y A247574 Cf. similar sequences listed in A247566. %K A247574 nonn,more %O A247574 2,1 %A A247574 _Vincenzo Librandi_, Sep 20 2014