Theta series of f.c.c. lattice with respect to edge.

Terms

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