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 A006397 M1236 #21 Jan 16 2025 14:17:46 %S A006397 1,0,1,2,4,10,34,114,475,2104,10177,52012,279874 %N A006397 Number of unsensed planar maps with n edges and without faces or vertices of degree 1. %D A006397 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006397 Timothy R. Walsh, <a href="http://dx.doi.org/10.1137/0604018">Generating nonisomorphic maps without storing them</a>, SIAM J. Algebraic Discrete Methods 4 (1983), no. 2, 161-178. %Y A006397 Cf. A006385, A006389, A006396 (sensed), A379435 (rooted). %K A006397 nonn,more %O A006397 0,4 %A A006397 _N. J. A. Sloane_ %E A006397 a(9)-a(12) from _Sean A. Irvine_, Mar 28 2017 %E A006397 a(0)-a(2) prepended by _Andrew Howroyd_, Jan 16 2025