Number of distinct hexaflexagons of length n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =7a(6) =8a(7) =17a(8) =21a(9) =47a(10) =63a(11) =132a(12) =205a(13) =411a(14) =685a(15) =1353a(16) =2385a(17) =4643a(18) =8496a(19) =16430a(20) =30735a(21) =59343a(22) =112531a(23) =217245a(24) =415628a(25) =803209a(26) =1545463a(27) =2991191a(28) =5778267a(29) =11201883