A395879 Number of oriented polyominoes in the {6,5} tessellation of the hyperbolic plane.

1, 1, 3, 19, 118, 914, 7499, 65271, 587907, 5453628, 51742827, 500364560

Offset

1,3

Comments

For oriented polyominoes, chiral pairs are counted as two.

Links

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

Wiki page indexing 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} = A221184.

Mathematica

(* Cf. A394862 with p=6 and q=5. *)

Crossrefs

Cf. A221184, A393730, A394862.

Sequence in context: A098444 A290477 A321002 * A395880 A395881 A395882

Adjacent sequences: A395876 A395877 A395878 * A395880 A395881 A395882

Keyword

nonn,more

Author

John Mason, Érika Roldán, and Rosemberg Toalá-Enríquez, May 14 2026

Status

approved