Theta series of A_18 lattice.

Terms

a(0) =1a(1) =342a(2) =23256a(3) =548454a(4) =5756202a(5) =33953760a(6) =145404264a(7) =501480756a(8) =1455087222a(9) =3744992834a(10) =8666394912a(11) =18652602708a(12) =37257431778a(13) =70992509796a(14) =127919023344a(15) =222954244860a(16) =372270931974a(17) =606984681420a(18) =955026275808