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 A006400 M1404 #26 Jan 16 2025 16:21:54 %S A006400 1,0,0,1,1,2,5,11,33,117,431,1755,7485 %N A006400 Number of sensed simple planar maps with n edges and without vertices of degree 1. %C A006400 A simple planar map is a planar map without loops or parallel edges. - _Andrew Howroyd_, Jan 16 2025 %D A006400 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006400 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 A006400 Cf. A006384, A006388, A006394, A006401 (unsensed), A379436 (rooted). %K A006400 nonn,more %O A006400 0,6 %A A006400 _N. J. A. Sloane_ %E A006400 a(11) and a(12) from _Sean A. Irvine_, Mar 30 2017 %E A006400 a(0)-a(2) prepended by _Andrew Howroyd_, Jan 14 2025