0,2

Hankel transform of A115142.

G.f.: (1-5x+5x^3-x^4)/(1+x+x^2)^4; a(n)=-(2n^3+9n^2+7n-6)*cos(2*pi*n/3)/6-sqrt(3)*(2n^3+21n^2+55n+42)*sin(2*pi*n/3)/18;

Sequence in context: A038534 A117755 A144114 this_sequence A022421 A075395 A085367

Adjacent sequences: A144698 A144699 A144700 this_sequence A144702 A144703 A144704

easy,sign

Paul Barry (pbarry(AT)wit.ie), Sep 19 2008