Growth function of an infinite cubic graph (number of nodes at distance <=n from fixed node).

Terms

a(0) =1a(1) =4a(2) =10a(3) =22a(4) =46a(5) =81a(6) =129a(7) =198a(8) =284a(9) =392a(10) =530a(11) =691a(12) =883a(13) =1114a(14) =1374a(15) =1674a(16) =2022a(17) =2405a(18) =2837a(19) =3326a(20) =3856a(21) =4444a(22) =5098a(23) =5799a(24) =6567a(25) =7410a(26) =8306a(27) =9278a(28) =10334a(29) =11449