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A215018 Number of unsensed hypermaps with n darts and any genus. 5
1, 3, 7, 26, 91, 490, 2785, 20434, 171579, 1671193, 18192737, 218487504 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

Timothy R. Walsh, Space-efficient generation of nonisomorphic maps and hypermaps

T. R. Walsh, Space-Efficient Generation of Nonisomorphic Maps and Hypermaps, J. Int. Seq. 18 (2015) # 15.4.3

CROSSREFS

Cf. A090371, A118094, A214819, A214820, A057005; A214821-A214823, A215017, A215018.

Sequence in context: A328280 A258311 A184459 * A069738 A057005 A158561

Adjacent sequences:  A215015 A215016 A215017 * A215019 A215020 A215021

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 01 2012

STATUS

approved

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Last modified June 24 17:51 EDT 2021. Contains 345419 sequences. (Running on oeis4.)