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 A111576 #7 May 18 2020 14:59:21 %S A111576 0,0,0,0,0,0,22,51,146 %N A111576 Number of minimal non-2-stack-sortable permutations of length n. %D A111576 V. Vatter, The Enumeration and Structure of Permutation Classes, Ph. D. Dissertation, Rutgers Univ., Math. Dept., 2006. %H A111576 M. D. Atkinson, M. M. Murphy and N. Ruskuc, <a href="https://doi.org/10.1016/S0304-3975(01)00270-5">Sorting with two ordered stacks in series</a>, Theoret. Comput. Sci. 289 (2002), 205-223. %H A111576 R. E. Tarjan, <a href="https://doi.org/10.1145/321694.321704">Sorting using networks of queues and stacks</a>, JACM, 19 (1972), 341-346. %K A111576 nonn,more %O A111576 1,7 %A A111576 _N. J. A. Sloane_, Nov 17 2005