A067648 - OEIS

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A067648

Number of knot diagrams of type 2PI with n crossings and two outgoing strings.

0, 2, 0, 2, 4, 12, 60, 226, 1076, 5156, 24984, 128548, 663040, 3514968, 18918792, 103123906, 569877652, 3180066004, 17921451960, 101842206548, 583109887600, 3361640932872, 19499226668816 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`J. L. Jacobsen and P. Zinn-Justin, A Transfer Matrix approach to the Enumeration of Knots`
	CROSSREFS	`Cf. A054993, A067647.` `Sequence in context: A194765 A058210 A079550 * A052438 A158855 A005074` `Adjacent sequences: A067645 A067646 A067647 * A067649 A067650 A067651`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Feb 05 2002`
	EXTENSIONS	`Reference gives two further terms.`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.