A210581 Bras-Amorós number f_n for numerical semigroups of genus n.

1, 2, 7, 23, 68, 200, 615, 1764, 5060, 14626, 41785, 117573, 332475, 933891, 2609832, 7278512

Offset

0,2

Links

Table of n, a(n) for n=0..15.

M. Bernardini, Fernando Torres, Counting numerical semigroups by genus and even gaps, arXiv:1612.01212 [math.CO], 2016-2017; Discrete Mathematics 340.12 (2017): 2853-2863.

Maria Bras-Amorós, Ordinarization Transform of a Numerical Semigroup and Semigroups with a Large Number of Intervals, arXiv:1203.5000 [math.NT], 2012. See Table on p. 11.

Crossrefs

Cf. A007323, A124506.

Sequence in context: A185250 A048496 A369840 * A037488 A129669 A037568

Adjacent sequences: A210578 A210579 A210580 * A210582 A210583 A210584

Keyword

nonn,hard,more

Author

Jonathan Vos Post, Mar 22 2012

Extensions

a(15) from Maria Bras-Amorós, Mar 23 2021

Status

approved