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 A028351 #6 Oct 13 2013 01:08:38 %S A028351 1,0,1,1,5,9,33,85,276,827,2693,8626,28639,95393,323367,1104525, %T A028351 3813797,13266366,46509357,164098390 %N A028351 Dimension of invariant subspace of Lie polynomials of degree 2n under action of SL_2(C) on free Lie algebra of rank 2. %D A028351 M. Bremner, Lie invariants of degree ten, Int. J. Math. Game Theory Algebra, 8 (1998), no. 2-3, 115-122. %F A028351 Formula in C. Reutenauer, Free Lie Algebras, pages 206-208. %K A028351 nonn %O A028351 1,5 %A A028351 _Murray R. Bremner_