Sizes of clusters in hexagonal lattice A_2 centered at deep hole.

Terms

a(0) =3a(1) =6a(2) =12a(3) =18a(4) =21a(5) =27a(6) =30a(7) =36a(8) =42a(9) =48a(10) =54a(11) =63a(12) =69a(13) =75a(14) =78a(15) =84a(16) =90a(17) =96a(18) =102a(19) =114a(20) =120a(21) =123a(22) =129a(23) =135a(24) =141a(25) =144a(26) =150a(27) =156a(28) =168a(29) =174