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 A247577 #7 Sep 20 2014 14:11:26 %S A247577 3,3,5,5,7,21,9,27,11,55,13,39,43,15,17,34,55,171,21 %N A247577 Base-16 state complexity of partitioned deterministic finite automaton (PDFA) for the periodic sequence (123...n)*. %H A247577 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 A247577 Cf. similar sequences listed in A247566. %K A247577 nonn,more %O A247577 2,1 %A A247577 _Vincenzo Librandi_, Sep 20 2014