%I #3 Mar 30 2012 18:52:39
%S -1,1,3,7,15,25,33,43,45,55,63,61,69,55,81,37,63,67,93,73,141,133,159,
%T 163,207,217,231,247,261,355,363,349,375,343,477,469,483,439,465,457,
%U 531,439,447,439,453,505,525,439,441,469,477,469
%N (2*n)-th twin prime minus 2*(n-th twin prime).
%F a(n)=A001097(2n)-2*A001097(n).
%e a(1)=-1 because A001097(2*1)-2*A001097(1)=5-2*3=-1.
%Y Cf. A066066.
%K sign
%O 1,3
%A _Juri-Stepan Gerasimov_, Jun 02 2010