Number of row convex polyhexes with n cells.

Terms

a(0) =1a(1) =3a(2) =11a(3) =44a(4) =184a(5) =784a(6) =3370a(7) =14544a(8) =62862a(9) =271804a(10) =1175133a(11) =5079516a(12) =21951384a(13) =94847528a(14) =409767878a(15) =1770177486