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

Terms

a(0) =0a(1) =4a(2) =32a(3) =272a(4) =256a(5) =1156a(6) =2176a(7) =3692a(8) =2048a(9) =8496a(10) =9248a(11) =15196a(12) =17408a(13) =22324a(14) =29536a(15) =39820a(16) =16384a(17) =56144a(18) =67968a(19) =79252a(20) =73984a(21) =111956a(22) =121568a(23) =143176a(24) =139264a(25) =184852a(26) =178592a(27) =238884a(28) =236288a(29) =285940