A046723 - OEIS

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A046723

Number of semi-meanders of order n with 4 components.

1, 4, 17, 66, 254, 956, 3584, 13256, 49052, 179552, 658560 (list; graph; refs; listen; history; internal format)

	OFFSET	`4,2`
	LINKS	`P. Di Francesco, O. Golinelli and E. Guitter, Meander, folding and arch statistics.`
	CROSSREFS	`Cf. A000682.` `Sequence in context: A102207 A202555 A045992 * A030529 A081113 A114587` `Adjacent sequences: A046720 A046721 A046722 * A046724 A046725 A046726`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.