0,2

The denominator is a parameterisation of the Alexander polynomial for the knot 8_12. The g.f. is the image of the g.f. of A099453 under the modified Chebyshev transform A(x)->(1/(1+x^2)^2)A(x/(1+x^2)).

The Rolfsen Knot Table

G.f.: 1/(1-7x+13x^2-7x^3+x^4); a(n)=A099454(n)-A099454(n-2).

Sequence in context: A095931 A026856 A038748 this_sequence A102053 A058681 A110310

Adjacent sequences: A099452 A099453 A099454 this_sequence A099456 A099457 A099458

easy,nonn

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