Theta series of 4-dimensional lattice A_2 tensor A2, with det 81, minimal norm 4.

Terms

a(0) =1a(1) =0a(2) =18a(3) =12a(4) =0a(5) =36a(6) =36a(7) =0a(8) =90a(9) =12a(10) =0a(11) =72a(12) =84a(13) =0a(14) =144a(15) =72a(16) =0a(17) =108a(18) =36a(19) =0a(20) =252a(21) =96a(22) =0a(23) =144a(24) =180a(25) =0a(26) =252a(27) =12a(28) =0a(29) =180