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%I #8 Dec 19 2016 01:58:04
%S 0,1,3,5,8,12,17,22,26,33,41,49,56,66,77,86,96,107,121,135,148,162,
%T 179,196,206,225,243,263,280,302,323,344,364,385,411,433,456,482,511,
%U 538,560,589,617,649,676,708,741,774,798,831,869,903,936,972,1013,1052
%N a(n) = Sum_{k=1..n-1} ceiling(k^2/n).
%D M. Eichler and D. Zagier, The Theory of Jacobi Forms, Birkhauser, 1985, p. 103.
%p f := n->sum( ceil(k^2/n), k=1..n-1);
%o (PARI) a(n)=sum(k=1,n-1,ceil(k^2/n))
%K nonn
%O 1,3
%A _N. J. A. Sloane_
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