Theta series of E_8 lattice with respect to midpoint of edge.

Terms

a(0) =2a(1) =56a(2) =252a(3) =688a(4) =1514a(5) =2664a(6) =4396a(7) =7056a(8) =9828a(9) =13720a(10) =19264a(11) =24336a(12) =31502a(13) =40880a(14) =48780a(15) =59584a(16) =74592a(17) =86688a(18) =101308a(19) =123088a(20) =137844a(21) =159016a(22) =190764a(23) =207648a(24) =235986a(25) =275184a(26) =297756a(27) =335664a(28) =384160a(29) =410760