Theta series of D_9 lattice.

Terms

a(0) =1a(1) =144a(2) =2034a(3) =7392a(4) =22608a(5) =44640a(6) =93984a(7) =141120a(8) =262386a(9) =343536a(10) =557280a(11) =703584a(12) =1068384a(13) =1234080a(14) =1851264a(15) =2057280a(16) =2884176a(17) =3231936a(18) =4428242a(19) =4639392a(20) =6455520a(21) =6670272a(22) =8814816a(23) =9320256a(24) =12065568a(25) =12152880a(26) =16161120a(27) =16124544a(28) =20496960a(29) =20906208