Theta series of direct sum of 2 copies of b.c.c. lattice.

Terms

a(0) =1a(1) =0a(2) =0a(3) =16a(4) =12a(5) =0a(6) =64a(7) =96a(8) =60a(9) =0a(10) =0a(11) =240a(12) =160a(13) =0a(14) =384a(15) =416a(16) =252a(17) =0a(18) =0a(19) =720a(20) =312a(21) =0a(22) =960a(23) =1056a(24) =544a(25) =0a(26) =0a(27) =1312a(28) =960a(29) =0