Theta series of b.c.c. lattice with respect to short edge.

Terms

a(0) =2a(1) =6a(2) =6a(3) =8a(4) =12a(5) =6a(6) =12a(7) =18a(8) =6a(9) =14a(10) =18a(11) =12a(12) =18a(13) =18a(14) =12a(15) =12a(16) =30a(17) =18a(18) =14a(19) =24a(20) =6a(21) =30a(22) =30a(23) =12a(24) =24a(25) =24a(26) =18a(27) =24a(28) =30a(29) =12