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 A006394 M2498 #26 Jan 16 2025 16:26:45 %S A006394 1,1,1,3,5,15,52,213,1002,5167,27967,158447,926786 %N A006394 Number of sensed planar maps with n edges and without loops or parallel edges. %C A006394 The planar maps considered here are connected. A planar map without loops or parallel edges is called simple. - _Andrew Howroyd_, Jan 16 2025 %D A006394 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006394 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 A006394 Cf. A006384, A006390, A006395 (unsensed), A022558 (rooted). %K A006394 nonn,more %O A006394 0,4 %A A006394 _N. J. A. Sloane_ %E A006394 a(9)-a(12) from _Sean A. Irvine_, Mar 30 2017 %E A006394 a(0)=1 prepended by _Andrew Howroyd_, Jan 16 2025