Theta series of A_17 lattice.

Terms

a(0) =1a(1) =306a(2) =18360a(3) =376176a(4) =3406086a(5) =17783496a(6) =70085016a(7) =222878160a(8) =606828294a(9) =1467198158a(10) =3232761480a(11) =6610437216a(12) =12689365284a(13) =23141407896a(14) =40339237032a(15) =67639875264a(16) =109818485334a(17) =173032004196a(18) =265536985560a(19) =398488725216a(20) =585449871444a(21) =843755783448