Size (b^3_n) of unit sphere in a certain graph (see Hazama article for precise definition).

Terms

a(0) =0a(1) =0a(2) =2a(3) =5a(4) =9a(5) =14a(6) =22a(7) =36a(8) =60a(9) =99a(10) =161a(11) =260a(12) =420a(13) =680a(14) =1102a(15) =1785a(16) =2889a(17) =4674a(18) =7562a(19) =12236a(20) =19800a(21) =32039a(22) =51841a(23) =83880a(24) =135720a(25) =219600a(26) =355322a(27) =574925a(28) =930249a(29) =1505174