cp's OEIS Frontend

A026064 a(n) = (d(n)-r(n))/2, where d = A026063 and r is the periodic sequence with fundamental period (1,1,0,1).

%I A026064 #12 Mar 17 2021 08:17:08
%S A026064 35,59,90,127,172,225,287,357,437,527,628,739,862,997,1145,1305,1479,
%T A026064 1667,1870,2087,2320,2569,2835,3117,3417,3735,4072,4427,4802,5197,
%U A026064 5613,6049,6507,6987,7490,8015,8564,9137,9735,10357,11005,11679,12380,13107,13862,14645,15457,16297
%N A026064 a(n) = (d(n)-r(n))/2, where d = A026063 and r is the periodic sequence with fundamental period (1,1,0,1).
%H A026064 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1,1,-3,3,-1).
%F A026064 a(n)=(n + 6)*(n^2 + 30*n + 71)/12 - 0.375 + 0.125*( - 1)^n - 0.25*cos(n*Pi/2) [From _Richard Choulet_, Dec 13 2008]
%F A026064 G.f.: x^6*( 35-46*x+18*x^2-x^3-33*x^4-17*x^6+46*x^5 ) / ( (1+x)*(x^2+1)*(x-1)^4 ). - _R. J. Mathar_, Jun 23 2013
%K A026064 nonn,easy
%O A026064 6,1
%A A026064 _Clark Kimberling_