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A110326 Diagonal sums of triangle A110324. 2

%I

%S 1,-1,-3,-2,-11,-3,-23,-4,-39,-5,-59,-6,-83,-7,-111,-8,-143,-9,-179,

%T -10,-219,-11,-263,-12,-311,-13,-363,-14,-419,-15,-479,-16,-543,-17,

%U -611,-18,-683,-19,-759,-20,-839,-21,-923,-22,-1011,-23,-1103,-24,-1199,-25,-1299,-26,-1403,-27,-1511,-28,-1623,-29,-1739

%N Diagonal sums of triangle A110324.

%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,3,0,-3,0,1).

%F G.f.: (1-x-6x^2+x^3+x^4)/((1+x)^3(1-x)^3); a(n)=3a(n-2)-3a(n-4)+a(n-6); a(n)=-(n^2+3n-1)/4-(n^2+n-3)(-1)^n/4.

%K easy,sign

%O 0,3

%A _Paul Barry_, Jul 20 2005

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Last modified July 25 19:34 EDT 2021. Contains 346291 sequences. (Running on oeis4.)