Theta series of square lattice with respect to deep hole.

Terms

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