Theta series of D_16 lattice.

Terms

a(0) =1a(1) =480a(2) =29152a(3) =525952a(4) =3994080a(5) =18626112a(6) =67978880a(7) =197120256a(8) =509145568a(9) =1143441760a(10) =2428524096a(11) =4658843520a(12) =8705492608a(13) =15000919872a(14) =25593401600a(15) =40864033536a(16) =65187410400a(17) =98098623936a(18) =148724365664a(19) =213678303360a(20) =310833534528a(21) =430766443520a(22) =605650030464a(23) =813970121472