A319322 Number of row convex polyhexes with n cells.

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.)

Links

Table of n, a(n) for n=1..16.

Adam Gruber, Java program to count lattice animals.

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

Adjacent sequences: A319319 A319320 A319321 * A319323 A319324 A319325

Keyword

nonn,more

Author

David Bevan, Sep 18 2018

Status

approved