%I #12 Mar 17 2021 08:54:24

%S 52,84,123,170,225,290,364,448,542,648,765,894,1035,1190,1358,1540,

%T 1736,1948,2175,2418,2677,2954,3248,3560,3890,4240,4609,4998,5407,

%U 5838,6290,6764,7260,7780,8323,8890,9481,10098,10740,11408,12102,12824,13573,14350,15155,15990,16854

%N a(n) = (d(n)-r(n))/2, where d = A026066 and r is the periodic sequence with fundamental period (1,0,0,0).

%H <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1,1,-3,3,-1).

%F G.f.: x^7*( 52-72*x+27*x^2+x^3+74*x^5-28*x^6-52*x^4 ) / ( (1+x)*(x^2+1)*(x-1)^4 ). - _R. J. Mathar_, Jun 23 2013

%Y Cf. A026066.

%K nonn,easy

%O 7,1

%A _Clark Kimberling_