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 A006445 M0172 #13 Jan 10 2018 17:19:01 %S A006445 0,0,0,0,0,1,0,1,2,1,4,9,12,27,50,99,188,386,740,1528,3012,6192,12376, %T A006445 25594,51628,107135,218100,453895,930812,1943281,4009512,8394915, %U A006445 17414512 %N A006445 Number of n-edge 3-connected planar maps with a sense-reversing automorphism. %C A006445 Maps are counted up to isomorphism which is not restricted to those that preserve the orientation of the sphere. %D A006445 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %D A006445 Computed by Nick Wormald (unpublished). %H A006445 T. R. S. Walsh, <a href="/A007401/a007401.pdf">Number of sensed planar maps with n edges and m vertices</a> %K A006445 nonn %O A006445 1,9 %A A006445 _N. J. A. Sloane_, T. R. S. Walsh, personal communication