A395876 - OEIS

%I #6 May 16 2026 05:35:38

%S 1,1,2,12,57,366,2340,16233,115663,851605,6407446,49163676,383267108

%N Number of oriented polyominoes in the {5,7} 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} = A005038.

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

%Y Cf. A005038, A393727, A394862.

%K nonn,more

%O 1,3

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