Theta series of planar hexagonal lattice (A2) with respect to deep hole.

Terms

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