Theta series of D_7 lattice.

Terms

a(0) =1a(1) =84a(2) =574a(3) =1288a(4) =3444a(5) =4424a(6) =9240a(7) =11088a(8) =18494a(9) =19740a(10) =34440a(11) =31304a(12) =52808a(13) =52248a(14) =74048a(15) =71120a(16) =110964a(17) =94864a(18) =145222a(19) =132888a(20) =181384a(21) =163856a(22) =249480a(23) =201040a(24) =295960a(25) =264684a(26) =346696a(27) =314272a(28) =454608a(29) =352520