%I #5 Jun 13 2015 00:51:52

%S 1,-1,0,-2,1,-2,3,-3,5,-6,8,-11,14,-19,25,-33,44,-58,77,-102,135,-179,

%T 237,-314,416,-551,730,-967,1281,-1697,2248,-2978,3945,-5226,6923,

%U -9171,12149,-16094,21320,-28243,37414,-49563,65657,-86977,115220,-152634,202197,-267854,354831,-470051,622685,-824882

%N Diagonal sums of Riordan array (1-x-x^2,x(1-x)).

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0,1,-1).

%F G.f.: (1-x-x^2)/(1-x^2+x^3); a(n)=a(n-2)-a(n-3).

%K easy,sign

%O 0,4

%A _Paul Barry_, Jun 24 2005