Number of polyhexes of class PF2 with a particular symmetry.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =10a(5) =21a(6) =41a(7) =85a(8) =167a(9) =345a(10) =680a(11) =1421a(12) =2823a(13) =5953a(14) =11902a(15) =25341a(16) =50993a(17) =109409a(18) =221372a(19) =478189a(20) =972346a(21) =2112181a(22) =4313451a(23) =9415165a(24) =19301199a(25) =42303241a(26) =87015978a(27) =191398741a(28) =394888368a(29) =871297141