A099449 - OEIS

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A099449

An Alexander sequence for the knot 7_6.

1, 5, 18, 60, 197, 650, 2153, 7140, 23682, 78545, 260498, 863945, 2865282, 9502740, 31515953, 104523050, 346651997, 1149675660, 3812913618, 12645575405, 41939208002, 139091904605, 461300030418, 1529907284460, 5073956524397 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`The denominator is a parameterisation of the Alexander polynomial for the knot 7_6. The g.f. is the image of the g.f. of A030191 under the modified Chebyshev transform A(x)->(1/(1+x^2)^2)A(x/(1+x^2))`
	LINKS	`The Rolfsen Knot Table`
	FORMULA	`G.f.: 1/(1-5x+7x^2-5x^3+x^4); a(n)=A099448(n)-A099448(n-2).`
	CROSSREFS	`Sequence in context: A000340 A034567 A133648 * A104630 A062809 A122234` `Adjacent sequences: A099446 A099447 A099448 * A099450 A099451 A099452`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 16 2004`

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Last modified February 15 13:57 EST 2012. Contains 205810 sequences.