A170948 Number of chiral pairs of combinatorial maps with n edges.
0, 0, 0, 0, 11, 226, 3597, 55006, 892791, 15763270, 305360481, 6483720916, 150200835113, 3774756521566, 102339496556342, 2977913930684928, 92579209306356230, 3062597993515937128, 107418845568842941190, 3981908640735783136040, 155550641755207044201203
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..30
- Antonio Breda d'Azevedo, Alexander Mednykh, and Roman Nedela, Enumeration of maps regardless of genus: Geometric approach, Discrete Mathematics, Volume 310, 2010, Pages 1184-1203.
Formula
a(n) = (A170946(n) - A170947(n)) / 2. [Breda d'Azevedo, Mednykh & Nedela, Corollary 4.8] - Andrey Zabolotskiy, Jun 06 2024
Extensions
Name clarified, a(0)=0 prepended and a(19) onwards added by Andrew Howroyd, Jan 27 2025