id:A085973 - OEIS Search Results

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

+0
2

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

	OFFSET	`0,1`
	COMMENT	`There is no obligation to cross the lower road (cf. A077054).`
	CROSSREFS	`Cf. A077054, A086031.` `Adjacent sequences: A085970 A085971 A085972 this_sequence A085974 A085975 A085976` `Sequence in context: A068553 A077039 A103938 this_sequence A005265 A005266 A005267`
	KEYWORD	`nonn`
	AUTHOR	`njas and Jon Wild (wild(AT)music.mcgill.ca), Aug 25 2003`

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