A054937 Number of chiral pairs of planar maps with n edges.
0, 0, 0, 0, 5, 64, 655, 5858, 51369, 448982, 3967466, 35603366, 324990677, 3016738988, 28449849867, 272233685444, 2639649712580, 25902435997188
Offset: 0
Links
- V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.
Formula
Extensions
a(0)=0 prepended by Andrew Howroyd, Jan 13 2025