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 A006399 M1162 #17 Jan 16 2025 14:17:53 %S A006399 1,0,1,2,4,8,27,76,295,1188,5462,26580,138110 %N A006399 Number of unsensed planar maps with n edges and without loops or isthmuses. %D A006399 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006399 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 A006399 Cf. A006385, A006391, A006398 (sensed), A099553 (rooted). %K A006399 nonn,more %O A006399 0,4 %A A006399 _N. J. A. Sloane_ %E A006399 a(9)-a(12) from _Sean A. Irvine_, Mar 29 2017 %E A006399 a(0)-a(1) prepended by _Andrew Howroyd_, Jan 16 2025