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 A247568 #6 Sep 20 2014 09:52:47 %S A247568 2,3,8,20,6,8,16,27,40,110,24,156,15,60,32,272,54,57,80 %N A247568 Base-7 state complexity of partitioned deterministic finite automaton (PDFA) for the periodic sequence (123...n)*. %H A247568 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 A247568 Cf. similar sequences listed in A247566. %K A247568 nonn,more %O A247568 2,1 %A A247568 _Vincenzo Librandi_, Sep 20 2014