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A170946 Number of sensed unrooted maps with n edges. 7
2, 5, 20, 107, 870, 9436, 122840, 1863359, 32019826, 613981447, 12989756316, 300559406027, 7550660328494, 204687564072918, 5955893472990664, 185158932576089787, 6125200100394894738, 214837724735760642773 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Also number of "dessins d'enfants" with n edges. - Mark van Hoeij, Jan 23 2011
LINKS
Antonio Breda d'Azevedo, Alexander Mednykh and Roman Nedela, Table of n, a(n) for n = 1..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.
N. M. Adrianov, N. Ya. Amburg, V. A. Dremov, Yu. A. Levitskaya, E. M. Kreines, Yu. Yu. Kochetkov, V. F. Nasretdinova and G. B. Shabat, Catalog of dessins d'enfants with <= 4 edges, arXiv:0710.2658 [math.AG], 2007.
R. J. Mathar, Feynman diagrams of the QED vacuum polarization, vixra:1901.0148 (2019), Section V. Different from a(7) on.
R. de Mello Koch, S. Ramgoolam, Strings from Feynman graph counting: without large N, arXiv:1110.4858 [hep-th], 2012, (D.10). Different from a(7) on.
CROSSREFS
Cf. A268558 (inv. Euler Transf.)
Sequence in context: A227096 A152562 A006867 * A296727 A201224 A305922
Adjacent sequences: A170943 A170944 A170945 * A170947 A170948 A170949
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 21 2010
STATUS
approved

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Last modified August 29 18:55 EDT 2024. Contains 375518 sequences. (Running on oeis4.)