Theta series of D_6 lattice.

Terms

a(0) =1a(1) =60a(2) =252a(3) =544a(4) =1020a(5) =1560a(6) =2080a(7) =3264a(8) =4092a(9) =4380a(10) =6552a(11) =8160a(12) =8224a(13) =10200a(14) =12480a(15) =14144a(16) =16380a(17) =17400a(18) =18396a(19) =24480a(20) =26520a(21) =23040a(22) =31200a(23) =35904a(24) =32800a(25) =39060a(26) =42840a(27) =44608a(28) =49344a(29) =50520