A395885 Number of oriented polyominoes in the {7,5} tessellation of the hyperbolic plane.

1, 1, 3, 26, 203, 1968, 19863, 213000, 2361813, 26981172, 315421921, 3759812411

Offset

1,3

Comments

For oriented polyominoes, chiral pairs are counted as two.

Links

Table of n, a(n) for n=1..12.

Index entries for sequences related to non-euclidean polyforms

Formula

a(n) = P{p,q}(n) (the number of oriented {p,q} polyominoes of size n) is equal to P{p,oo}(n) for n <= q. In this case, P{p,oo} = A389561.

Mathematica

(* Cf. A394862 with p=7 and q=5. *)

Crossrefs

Cf. A389561, A393735, A394862.

Sequence in context: A355047 A228116 A091123 * A395886 A395887 A395888

Adjacent sequences: A395882 A395883 A395884 * A395886 A395887 A395888

Keyword

nonn,more

Author

John Mason, Érika Roldán, and Rosemberg Toalá-Enríquez, May 16 2026

Status

approved