Volume (multiplied by 3) of polyhedron formed by points (i,j,k) in Z^3 with i^2+j^2+k^2 = n.

Terms

a(0) =0a(1) =4a(2) =20a(3) =24a(4) =32a(5) =96a(6) =136a(7) =0a(8) =160a(9) =272a(10) =244a(11) =344a(12) =192a(13) =404a(14) =516a(15) =0a(16) =256a(17) =712a(18) =744a(19) =616a(20) =768a(21) =988a(22) =644a(23) =0a(24) =1088a(25) =1156a(26) =1484a(27) =1272a(28) =0a(29) =1740