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

Author

N. J. A. Sloane, May 08 2017

Keywords

• nonn

Links

• 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

Crossrefs

Cf. A006206, A286272.

Partial sums of A060280.

Extensions

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