A395880 - OEIS

%I #6 May 16 2026 05:35:07

%S 1,1,3,19,118,931,7735,68328,625230,5896203,56902058,559925062

%N Number of oriented polyominoes in the {6,6} tessellation of the hyperbolic plane.

%C For oriented polyominoes, chiral pairs are counted as two.

%H <a href="https://oeis.org/wiki/PF-Non-Euclidean">Wiki page indexing sequences related to non-euclidean polyforms</a>

%F 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.

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

%Y Cf. A221184, A393731, A394862.

%K nonn,more

%O 1,3

%A _John Mason_, Érika Roldán, and Rosemberg Toalá-Enríquez, May 14 2026