A067647 - OEIS

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A067647

Number of knot diagrams of type 1PI with n crossings and two outgoing strings.

0, 2, 4, 18, 108, 748, 5648, 45234, 378300, 3271204, 29049824, 263656356, 2436827328, 22871937208, 217536523260, 2092958991474, 20341256951692, 199471121367508, 1971730006936240, 19630246152650228 (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, A067648.` `Sequence in context: A020101 A099938 A135069 * A009667 A009508 A009418` `Adjacent sequences: A067644 A067645 A067646 * A067648 A067649 A067650`
	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 16 08:13 EST 2012. Contains 205893 sequences.