id:A129114 - OEIS Search Results

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Number of unrooted unlabeled connected triangular maps on a compact closed oriented surface with 2n faces (and thus 3n edges).

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2

3, 11, 81, 1228, 28174, 843186, 30551755, 1291861997, 62352938720, 3381736322813, 203604398647922, 13475238697911184, 972429507963453210, 75993857157285258473, 6393779463050776636807, 576237114190853665462712 (list; graph; listen)

	OFFSET	`1,1`
	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, acting transitively and with no fixed point.`
	CROSSREFS	`Connected version of A129115. Unrooted version of A062980.` `Cf. also A121350, A121352, A005133.` `Adjacent sequences: A129111 A129112 A129113 this_sequence A129115 A129116 A129117` `Sequence in context: A117765 A046153 A099341 this_sequence A136649 A062580 A097495`
	KEYWORD	`nonn`
	AUTHOR	`Samuel Alexandre Vidal (samuel.vidal(AT)free.fr), Mar 30 2007.`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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