0,2

The denominator is a parameterisation of the Alexander polynomial for the knot 9_48. The g.f. is the image of the g.f. of A099459 under the modified Chebyshev transform A(x)->(1/(1+x^2)^2)A(x/(1+x^2)).

Dror Bar-Natan, The Rolfsen Knot Table

G.f.: 1/(1-7x+11x^2-7x^3+x^4); a(n)=A009460(n)-A099460(n-2).

Sequence in context: A014827 A141845 A048437 this_sequence A104553 A027241 A056197

Adjacent sequences: A099458 A099459 A099460 this_sequence A099462 A099463 A099464

easy,nonn

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