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 A006393 M3367 #16 Jan 16 2025 14:17:31 %S A006393 1,0,1,4,9,32,132,597,3064,17114,102274,643907,4219540 %N A006393 Number of unsensed planar maps with n edges and without faces of degree 1 or 2. %D A006393 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006393 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 A006393 Cf. A006385, A006389, A006392 (sensed), A379434 (rooted). %K A006393 nonn,more %O A006393 0,4 %A A006393 _N. J. A. Sloane_ %E A006393 a(8)-a(12) from _Sean A. Irvine_, Mar 29 2017 %E A006393 a(0)-a(1) prepended by _Andrew Howroyd_, Jan 16 2025