Theta series of D_18 lattice.

Terms

a(0) =1a(1) =612a(2) =48996a(3) =1207680a(4) =12573540a(5) =73617480a(6) =318102912a(7) =1090632960a(8) =3176573796a(9) =8148505828a(10) =18918517320a(11) =40578145920a(12) =81375600000a(13) =154398101832a(14) =279331331328a(15) =484986858240a(16) =812932819812