Sizes of successive clusters in hexagonal lattice A_2 centered at lattice point.

Terms

a(0) =1a(1) =7a(2) =7a(3) =13a(4) =19a(5) =19a(6) =19a(7) =31a(8) =31a(9) =37a(10) =37a(11) =37a(12) =43a(13) =55a(14) =55a(15) =55a(16) =61a(17) =61a(18) =61a(19) =73a(20) =73a(21) =85a(22) =85a(23) =85a(24) =85a(25) =91a(26) =91a(27) =97a(28) =109a(29) =109