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 A054937 #18 Jan 14 2025 19:13:28 %S A054937 0,0,0,0,5,64,655,5858,51369,448982,3967466,35603366,324990677, %T A054937 3016738988,28449849867,272233685444,2639649712580,25902435997188 %N A054937 Number of chiral pairs of planar maps with n edges. %H A054937 V. A. Liskovets, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/LISK/Derseq.html">Some easily derivable sequences</a>, J. Integer Sequences, 3 (2000), #00.2.2. %F A054937 a(n) = A006385(n) - A006443(n). - _R. J. Mathar_, Oct 01 2011 %Y A054937 Cf. A006384, A006385, A006443. %K A054937 nonn,easy %O A054937 0,5 %A A054937 _N. J. A. Sloane_, May 24 2000 %E A054937 a(0)=0 prepended by _Andrew Howroyd_, Jan 13 2025