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%I #5 Dec 19 2012 15:50:09
%S 2,6,13,22,35,52,74,100,132,170,215,266,325,392,468,552,646,750,865,
%T 990,1127,1276,1438,1612,1800,2002,2219,2450,2697,2960,3240,3536,3850,
%U 4182,4533,4902,5291,5700,6130,6580,7052,7546,8063,8602,9165,9752,10364,11000,11662,12350,13065,13806,14575
%N (d(n)-r(n))/2, where d = A008778 and r is the periodic sequence with fundamental period (1,1,0,1).
%F a(n)=(n + 2)*(n^2 + 10*n + 15)/12 - 0.375 + 0.125*( - 1)^n - 0.25*cos(n*Pi/2) [From _Richard Choulet_, Dec 13 2008]
%K nonn
%O 2,1
%A _Clark Kimberling_
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