id:A086031 - OEIS Search Results

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Number of nonisomorphic ways a loop can cross two parallel roads 2n times.

+0
3

1, 1, 3, 7, 37, 207, 1470, 11169, 91166, 776841, 6865598, 62443973 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`There is no obligation to cross the lower road (cf. A077054).`
	CROSSREFS	`Cf. A077054. Isomorphism classes from A085973.` `Sequence in context: A057625 A087208 A161675 this_sequence A152560 A162926 A042895` `Adjacent sequences: A086028 A086029 A086030 this_sequence A086032 A086033 A086034`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com) and Jon Wild (wild(AT)music.mcgill.ca), Aug 25 2003`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.