Number of distinct printable hexaflexagons of length n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =5a(6) =6a(7) =10a(8) =11a(9) =21a(10) =29a(11) =58a(12) =78a(13) =144a(14) =224a(15) =421a(16) =648a(17) =1185a(18) =1990a(19) =3668a(20) =6095a(21) =11079a(22) =19098a(23) =34891