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%I #13 Jan 31 2018 06:04:39
%S 0,1,1,2,4,5,8,10,13,17,20,25,29,34,40,45,52,58,65,73,80,89,97,106,
%T 116,125,136,146,157,169,180,193,205,218,232,245,260,274,289,305,320,
%U 337,353,370,388,405,424,442,461,481,500,521,541,562,584
%N a(n) = ceiling(n^2/5).
%H <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1,0,0,1,-2,1).
%F G.f. -x*(1+x)*(x^2-x+1)^2 / ( (x^4+x^3+x^2+x+1)*(x-1)^3 ). - _R. J. Mathar_, Jan 22 2011
%K nonn,easy
%O 0,4
%A _N. J. A. Sloane_.
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