Series expansion for radius of gyration on triangular lattice.

Terms

a(0) =0a(1) =0a(2) =6a(3) =24a(4) =102a(5) =468a(6) =2172a(7) =9978a(8) =45816a(9) =208686a(10) =944766a(11) =4253484a(12) =19046580a(13) =84891654a(14) =376756392a(15) =1665684774a(16) =7338822888a(17) =32233105398a(18) =141171369444a(19) =616694403366