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 A247578 #7 Sep 20 2014 14:11:17 %S A247578 2,6,4,20,12,42,8,18,40,110,24,78,84,60,16,18,36,171,80 %N A247578 Base-17 state complexity of partitioned deterministic finite automaton (PDFA) for the periodic sequence (123...n)*. %H A247578 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 A247578 Cf. similar sequences listed in A247566. %K A247578 nonn,more %O A247578 2,1 %A A247578 _Vincenzo Librandi_, Sep 20 2014