Number of 2-anisohedral polyhexes of order n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =3a(7) =27a(8) =66a(9) =226a(10) =380a(11) =879a(12) =1097a(13) =4419a(14) =3772a(15) =9488a(16) =6718a(17) =40023a(18) =12630a(19) =127213a(20) =76836