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Search: id:A129115
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A129115 Number of unrooted unlabeled not necessarily connected triangular maps on a compact closed oriented surface with 2n faces (and thus 3n edges). +0
2
1, 3, 17, 124, 1618, 33564, 956263, 33736198, 1402665692, 66902717187, 3596481426812, 215049652739982, 14154852098315796, 1016911004448831247, 79174846391508487198, 6640511488761139957873, 596865894849670793348763 (list; graph; listen)
OFFSET

0,2

COMMENT

Equivalently, the number of pair of permutations (sigma,tau) up to simultaneous conjugacy on a set of size 6*n with sigma^3=tau^2=1 with no fixed point.

CROSSREFS

Unconnected version of A129114. Unrooted, unconnected version of A062980.

Cf. also A121350, A121352, A005133.

Sequence in context: A074544 A121572 A074543 this_sequence A093460 A089815 A006759

Adjacent sequences: A129112 A129113 A129114 this_sequence A129116 A129117 A129118

KEYWORD

nonn

AUTHOR

Samuel Alexandre Vidal (samuel.vidal(AT)free.fr), Mar 30 2007.

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Last modified September 5 19:27 EDT 2008. Contains 143485 sequences.


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