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 A049292 #5 Mar 31 2012 20:08:10 %S A049292 1,31,1330,119315,17543016,4537258768 %N A049292 Number of subgroups of index n in fundamental group of a closed surface of characteristic -3. %C A049292 A formula in terms of irreducible characters of the symmetric group. %D A049292 V. A. Liskovets and A. Mednykh, Enumeration of subgroups in the fundamental groups of orientable circle bundles over surfaces, Commun. in Algebra, 28, No. 4 (2000), 1717-1738. %D A049292 A. D. Mednykh, On the number of subgroups in the fundamental group of a closed surface. Commun. in Algebra, 16, No 10 (1988), 2137-2148. %Y A049292 Cf. A003319, A027837, A049290-A049295. %K A049292 nonn,nice %O A049292 1,2 %A A049292 _Valery A. Liskovets_