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 A170948 #14 Jan 27 2025 14:25:59 %S A170948 0,0,0,0,11,226,3597,55006,892791,15763270,305360481,6483720916, %T A170948 150200835113,3774756521566,102339496556342,2977913930684928, %U A170948 92579209306356230,3062597993515937128,107418845568842941190,3981908640735783136040,155550641755207044201203 %N A170948 Number of chiral pairs of combinatorial maps with n edges. %H A170948 Andrew Howroyd, <a href="/A170948/b170948.txt">Table of n, a(n) for n = 0..30</a> %H A170948 Antonio Breda d'Azevedo, Alexander Mednykh, and Roman Nedela, <a href="https://doi.org/10.1016/j.disc.2009.11.017">Enumeration of maps regardless of genus: Geometric approach</a>, Discrete Mathematics, Volume 310, 2010, Pages 1184-1203. %F A170948 a(n) = (A170946(n) - A170947(n)) / 2. [Breda d'Azevedo, Mednykh & Nedela, Corollary 4.8] - _Andrey Zabolotskiy_, Jun 06 2024 %Y A170948 Cf. A170946 (sensed), A170947 (achiral), A214816 (unsensed). %K A170948 nonn %O A170948 0,5 %A A170948 _N. J. A. Sloane_, Feb 21 2010 %E A170948 Name clarified, a(0)=0 prepended and a(19) onwards added by _Andrew Howroyd_, Jan 27 2025