login
A319322
Number of row convex polyhexes with n cells.
0
1, 3, 11, 44, 184, 784, 3370, 14544, 62862, 271804, 1175133, 5079516, 21951384, 94847528, 409767878, 1770177486
OFFSET
1,2
COMMENTS
A polyhex is considered to be row convex if cells take contiguous positions in each row. (Multiple cells in a row are not connected.)
EXAMPLE
The only pentahexes that are not row convex are the shallow V shape and its 180-degree rotation. So a(5) = A001207(5) - 2 = 184.
CROSSREFS
Cf. A001207 (fixed polyhexes), A059716 (column convex polyhexes).
Sequence in context: A200613 A149073 A167011 * A059714 A059715 A026748
KEYWORD
nonn,more
AUTHOR
David Bevan, Sep 18 2018
STATUS
approved