%I #4 Mar 30 2012 16:50:01
%S 1,-8,-24,84,24,-144,-224,32,654,-560,-616,96,312,-1120,-1440,5456,
%T -272,-288,-2888,96,1008,-4048,-3680,576,16700,-5200,-216,896,2088,
%U -8160,-9920,128,-1584,-12512,-10640,41496,4440,-12464,-16224,2240,-2624,-18144,-21672,2464,864,-27232,-21056
%N Sum_{k=1..2n-1} J(4*n,k)*k^2, where J(i,j) is the Jacobi symbol.
%C Suggested by a formula in Petersson.
%D H. Petersson, Modulfunktionen und Quadratische Formen, Springer-Verlag, 1982; p. 98.
%Y Cf. A097541-A097543.
%K sign
%O 1,2
%A _N. J. A. Sloane_, Aug 27 2004