0,2

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))

The Rolfsen Knot Table

G.f.: 1/(1-5x+7x^2-5x^3+x^4); a(n)=A099448(n)-A099448(n-2).

Sequence in context: A000340 A034567 A133648 this_sequence A104630 A062809 A122234

Adjacent sequences: A099446 A099447 A099448 this_sequence A099450 A099451 A099452

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Oct 16 2004