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 A109458 #6 Aug 08 2015 23:59:33 %S A109458 2,4,12,48,308,3028,49490,1350894,62154403 %N A109458 Number of inequivalent Krom functions on n variables (or 2SAT instances) under permutations of variables. %D A109458 D. E. Knuth, The Art of Computer Programming, Vol. 4A, Section 7.1.1, p. 79. %Y A109458 See A109457 for definitions and references. %K A109458 nonn,hard,more %O A109458 0,1 %A A109458 _Don Knuth_, Aug 24 2005