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

Terms

a(0) =1a(1) =24a(2) =156a(3) =192a(4) =636a(5) =624a(6) =1312a(7) =1152a(8) =2556a(9) =1752a(10) =4056a(11) =2880a(12) =5152a(13) =4080a(14) =7872a(15) =4992a(16) =10236a(17) =6960a(18) =11388a(19) =8640a(20) =16536a(21) =9216a(22) =19680a(23) =12672a(24) =20512a(25) =15624a(26) =26520a(27) =15744a(28) =30912a(29) =20208