id:A078592 - OEIS Search Results

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Call two meanders from A005316 with 2n crossings equivalent if they differ by reflections in the X or Y axes. Sequence gives number of inequivalent meanders.

+0
3

1, 1, 2, 8, 42, 273, 1970, 15368, 126510, 1086546, 9652364, 88172609, 824506191, 7865294687, 76331857094, 751981532942, 7506432993145, 75811326673326, 773682540353704, 7969986193751019, 82798726340037900, 866804540900696571 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Symmetry group has order 4.`
	FORMULA	`a(n) = (A005316(2n)+A005316(n))/2.`
	CROSSREFS	`Adjacent sequences: A078589 A078590 A078591 this_sequence A078593 A078594 A078595` `Sequence in context: A005315 A121635 A002874 this_sequence A052646 A002856 A093461`
	KEYWORD	`nonn`
	AUTHOR	`njas and Jon Wild (wild(AT)music.mcgill.ca), Dec 08 2002`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.

AT&T Labs Research