Theta series of E_6 lattice.

Terms

a(0) =1a(1) =72a(2) =270a(3) =720a(4) =936a(5) =2160a(6) =2214a(7) =3600a(8) =4590a(9) =6552a(10) =5184a(11) =10800a(12) =9360a(13) =12240a(14) =13500a(15) =17712a(16) =14760a(17) =25920a(18) =19710a(19) =26064a(20) =28080a(21) =36000a(22) =25920a(23) =47520a(24) =37638a(25) =43272a(26) =45900a(27) =59040a(28) =46800a(29) =75600