0,2

The denominator is a parameterisation of the Alexander polynomial for the knot 6_2 (Miller Institute knot). The g.f. is the image of that of Fib(2n+2) 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/(1-3x+3x^2-3x^3+x^4); a(n)=A099444(n)-A099444(n-2).

Cf. A001906.

Sequence in context: A068425 A136444 A077854 this_sequence A004067 A092886 A135035

Adjacent sequences: A099442 A099443 A099444 this_sequence A099446 A099447 A099448

easy,nonn

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