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 A212816 #3 May 30 2012 11:26:17 %S A212816 9,11,14,20,24,27,28,40,45,48,54 %N A212816 Numbers n such that A212813(n) = 2. %D A212816 Bellamy, O. S.; Cadogan, C. C. Subsets of positive integers: their cardinality and maximality properties. Proceedings of the Tenth Southeastern Conference on Combinatorics, Graph Theory and Computing (Florida Atlantic Univ., Boca Raton, Fla., 1979), pp. 167--178, Congress. Numer., XXIII-XXIV, Utilitas Math., Winnipeg, Man., 1979. MR0561043 (82b:10006) %Y A212816 Cf. A212813, A212814, A212815. %K A212816 nonn,fini,full %O A212816 1,1 %A A212816 _N. J. A. Sloane_, May 30 2012