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 A186724 #25 May 01 2014 02:39:07 %S A186724 1,1,1,0,1,1,2,1,4,1,10,3,37,32,340,1608,18020,193907,2867725, %T A186724 32674058,1581632114,6705889824 %N A186724 Number of connected regular graphs with n nodes and girth at least 4. %H A186724 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/C_girth_ge_4">Connected regular graphs with girth at least 4</a> %H A186724 Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/C_k-reg_girth_ge_g_index">Index of sequences counting connected k-regular simple graphs with girth at least g</a> %F A186724 a(n) = sum of the n-th row of A186714. %Y A186724 Regular graphs, of any degree, with girth at least 4: this sequence (connected), A185214 (disconnected), A185314 (not necessarily connected). %Y A186724 Connected regular graphs of any degree with girth at least g: A005177 (g=3), this sequence (g=4), A186725 (g=5), A186726 (g=6), A186727 (g=7), A186728 (g=8), A186729 (g=9). %Y A186724 Connected k-regular simple graphs with girth at least 4: this sequence (any k), A186714 (triangle); specified degree k: A185114 (k=2), A014371 (k=3), A033886 (k=4), A058275 (k=5), A058276 (k=6), A181153 (k=7), A181154 (k=8), A181170 (k=9). %K A186724 nonn,hard,more %O A186724 0,7 %A A186724 _Jason Kimberley_, Sep 04 2011