[seqfan] Q on g.f. A138164

[Richard J. Mathar]

Is the generating function in http://oeis.org/A138164 correct?
The Maple implementation

vx := 2/sqrt(3)*sin(sin(x*3*sqrt(3)/2)/3) ;
A138164 := proc(n)
        1/(1-vx-vx^2) ;
        coeftayl(%,x=0,n) ;
end proc:
seq(%(n),n=0..13) ;

generates fractions from the power(x^3) on.