Theta series of direct sum of 2 copies of 4-dimensional lattice QQF.4.i.

Terms

a(0) =1a(1) =8a(2) =56a(3) =168a(4) =536a(5) =624a(6) =2328a(7) =1600a(8) =4184a(9) =4872a(10) =7824a(11) =6432a(12) =19320a(13) =10672a(14) =21568a(15) =22320a(16) =33752a(17) =23184a(18) =62904a(19) =32992a(20) =66000a(21) =61248a(22) =83040a(23) =58944a(24) =155832a(25) =75320a(26) =136912a(27) =130728a(28) =179776a(29) =117168