OFFSET
0,2
COMMENTS
The denominator 1-4x+7x^2-4x^3+x^4 is a parameterization of the Alexander polynomial for the knot 9_44. 1/(1-4x+7x^2-4x^3+x^4) is the image of the g.f. of A099456 under the modified Chebyshev transform A(x)->(1/(1+x^2)^2)A(x/(1+x^2)).
LINKS
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Oct 16 2004
STATUS
approved