Theta series of hexagonal lattice A_2 with respect to deep hole.

Terms

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