A286272 -id:A286272 - cp's OEIS frontend

A286271 a(0)=1; thereafter a(n) = Sum_{k=2..n+1} A006206(k).

1, 1, 2, 3, 5, 7, 11, 16, 24, 35, 53, 78, 118, 176, 266, 401, 611, 927, 1419, 2169, 3333, 5124, 7910, 12215, 18925, 29345, 45609, 70959, 110609, 172576, 269684, 421829, 660647, 1035602, 1625122, 2552322, 4012282, 6312136, 9938336, 15658610, 24689060, 38952138

Offset: 0

N. J. A. Sloane, May 08 2017

nonn

Marston Conder, S. Du, R. Nedela, and M. Skoviera, Regular maps with nilpotent automorphism group, Journal of Algebraic Combinatorics, December 2016, Volume 44, Issue 4, pp 863-874; DOI: 10.1007/s10801-016-0692-8

Cf. A006206, A286272.

Partial sums of A060280.

Offset and definition corrected by N. J. A. Sloane, Jun 16 2021

A286279 Number of quotients of ordinary hyperbolic triangle groups that act on a compact Riemann surface of genus n, up to isomorphism, duality/triality and reflection.

Original entry on oeis.org

11, 25, 28, 31, 33, 35, 33, 75, 73, 47, 56, 72, 41, 84, 76, 113, 62, 116, 56, 142, 93, 44, 99, 172, 73, 108, 170, 132, 99, 123, 75, 300, 103, 105, 167, 252, 62, 122, 185, 319, 114, 147, 84, 237, 214, 68, 158, 445, 137, 216, 159, 191, 154, 327, 162, 397, 155

Offset: 2

N. J. A. Sloane, May 08 2017

nonn

Andrey Zabolotskiy, Table of n, a(n) for n = 2..101
Marston Conder, Home Page (Contains tables of regular maps, hypermaps and polytopes, trivalent symmetric graphs, and surface actions)
Marston Conder, Quotients of triangle groups acting on surfaces of genus 2 to 101

Cf. A286272-A286278.

Terms a(13) and beyond from Conder's file added by Andrey Zabolotskiy, Dec 14 2022

cp's OEIS Frontend

A286271 a(0)=1; thereafter a(n) = Sum_{k=2..n+1} A006206(k).

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