%I A120691
%S A120691 2,1,1,1,0,3,3,0,5,5,0,7,7,0,9,9,0,11,11,0,13,13,0,15,15,0,17,17,0,19,
%T A120691 19,0,21,21,0,23,23,0,25,25,0,27,27,0,29,29,0,31,31,0,33,33,0,35,35,0,
%U A120691 37,37,0,39,39
%V A120691 2,-1,1,-1,0,3,-3,0,5,-5,0,7,-7,0,9,-9,0,11,-11,0,13,-13,0,15,-15,0,17,
               -17,0,19,-19,0,
%W A120691 21,-21,0,23,-23,0,25,-25,0,27,-27,0,29,-29,0,31,-31,0,33,-33,0,35,-35,
               0,37,-37,0,39,
%X A120691 -39
%N A120691 First differences of coefficients in the continued fraction for e.
%C A120691 First differences of A003417.
%F A120691 G.f.: (1-x)(2+x+2x^2-3x^3-x^4+x^6)/(1-2x^3+x^6); a(n)=2*C(0,n)-C(1,n)-2*sin(2*pi*(n-1)/
               3)*floor((2n-1)/3)/sqrt(3);
%Y A120691 Cf. A102899.
%Y A120691 Sequence in context: A118404 A089339 A127284 this_sequence A111941 A153462 
               A126310
%Y A120691 Adjacent sequences: A120688 A120689 A120690 this_sequence A120692 A120693 
               A120694
%K A120691 easy,sign
%O A120691 0,1
%A A120691 Paul Barry (pbarry(AT)wit.ie), Jun 27 2006