Number of unrooted self-avoiding walks of n steps on honeycomb lattice.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =18a(7) =31a(8) =61a(9) =107a(10) =207a(11) =378a(12) =724a(13) =1333a(14) =2537a(15) =4723a(16) =8938a(17) =16674a(18) =31455a(19) =58805a(20) =110642a(21) =206849a(22) =388444a(23) =726236a(24) =1361766a(25) =2544568a(26) =4765466a(27) =8900805a(28) =16652803a(29) =31085427