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 A065407 #5 Mar 30 2012 19:01:04 %S A065407 1,3,9,45,2949 %N A065407 Number of levels in lattice formed by normal play partisan games born on day n. %D A065407 Dan Calistrate, Marc Paulhus and David Wolfe, On the lattice structure of finite games, in More Games of No Chance (Berkeley, CA, 2000), Math. Sci. Res. Inst. Publ., 42, Cambridge Univ. Press, Cambridge, 2002, pp. 25-30. %Y A065407 Cf. A065401, A065402, A047995, A037142. Equals 2*A065402(n-1) + 1. %K A065407 nonn %O A065407 0,2 %A A065407 _R. K. Guy_, Nov 23 2001