id:A067646 - OEIS Search Results

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Number of prime alternating tangles (or knots) with two connected components.

+0
3

1, 2, 4, 8, 24, 72, 264, 1074, 4490, 20296, 92768, 439148, 2118654, 10377708, 51740280, 260545092, 1328891356, 6836872181 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`J. L. Jacobsen and P. Zinn-Justin, A Transfer Matrix approach to the Enumeration of Knots` `S. R. Finch, Knots, links and tangles`
	CROSSREFS	`Equals A067644 + 2*A067645.` `Sequence in context: A114900 A115115 A026097 this_sequence A152875 A065654 A002908` `Adjacent sequences: A067643 A067644 A067645 this_sequence A067647 A067648 A067649`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Feb 05 2002`
	EXTENSIONS	`More terms from AntonioG. Astudillo (afg_astudillo(AT)lycos.com), Apr 21 2003`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.