A085973 - OEIS

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A085973

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

3, 2, 5, 22, 123, 800, 5754, 44514, 363893, 3106288, 27457050, 249768040, 2327398572 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	COMMENTS	`There is no obligation to cross the lower road (cf. A077054).`
	CROSSREFS	`Cf. A077054, A086031.` `Sequence in context: A187943 A077039 A103938 * A005265 A005266 A005267` `Adjacent sequences: A085970 A085971 A085972 * A085974 A085975 A085976`
	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 February 16 17:48 EST 2012. Contains 205939 sequences.