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 A006401 M1384 #22 Jan 16 2025 16:20:29 %S A006401 1,0,0,1,1,2,5,10,28,86,285,1055,4211 %N A006401 Number of unsensed simple planar maps with n edges and without vertices of degree 1. %C A006401 A simple planar map is a planar map without loops or parallel edges. - _Andrew Howroyd_, Jan 16 2025 %D A006401 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006401 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 A006401 Cf. A006385, A006389, A006395, A006400 (sensed), A379436 (rooted). %K A006401 nonn,more %O A006401 0,6 %A A006401 _N. J. A. Sloane_ %E A006401 a(11)-a(12) from _Sean A. Irvine_, Mar 31 2017 %E A006401 a(0)-a(2) prepended by _Andrew Howroyd_, Jan 16 2025