A214814 Number of unsensed genus 2 maps with n edges.

0, 0, 0, 0, 4, 76, 1395, 24950, 427336, 6987100, 109761827, 1668376886, 24689351504, 357467967214, 5083309341304, 71209097157108, 984963603696282, 13477371260785608, 182698708325667710, 2456600457435363198, 32796863046711248526

Offset

0,5

Links

Table of n, a(n) for n=0..20.

Evgeniy Krasko and Alexander Omelchenko, Enumeration of Unsensed Orientable Maps on Surfaces of a Given Genus, arXiv:1712.10139 [math.CO], 2017.

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

Column k=2 of A379439.

Cf. A006301 (rooted), A104595 (sensed).

Cf. A006385, A006387, A214815, A214816.

Sequence in context: A240281 A114453 A093184 * A144210 A220793 A220958

Adjacent sequences: A214811 A214812 A214813 * A214815 A214816 A214817

Keyword

nonn

Author

N. J. A. Sloane, Jul 31 2012

Extensions

More terms from Evgeniy Krasko, Sep 17 2017

Status

approved