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 A049313 #12 Apr 08 2019 03:41:33 %S A049313 1,1,1,2,2,6,12,79,792,19576,886288,75369960,11856006240, %T A049313 3467430423264,1893448825054528,1938818712501985736, %U A049313 3737086626658278741376,13606268915761294708760704,93863103860384959101157737728 %N A049313 Switching classes of tournaments on n nodes. %H A049313 L. Babai and P. J. Cameron, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v7i1r38">Automorphisms and enumeration of switching classes of tournaments</a>, Electron. J. Combin., 7 (2000), no. 1, Research Paper 38, 25 pp. %H A049313 P. J. Cameron, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL3/groups.html">Sequences realized by oligomorphic permutation groups</a>, J. Integ. Seqs. Vol. 3 (2000), #00.1.5. %F A049313 Same as for switching classes of graphs but summed only over "level" permutations (same power of 2 divides all cycle lengths) %e A049313 a(4)=2: the "local orders" form one switching class and the class containing a 3-cycle dominating a point the other. %Y A049313 Cf. A002854. %K A049313 nonn,nice %O A049313 1,4 %A A049313 _Peter J. Cameron_ %E A049313 More terms from _Vladeta Jovovic_, Mar 01 2000