A393742 - OEIS

%I #9 Mar 07 2026 05:48:44

%S 1,1,4,21,183,1918,22892,290123,3836377,52291348,730272739

%N Number of free polyominoes in the {8,6} tessellation of the hyperbolic plane.

%F a(n) = P{p,q}(n) (the number of {p,q} polyominoes of size n) is equal to P{p,oo}(n) for n <= q; also P{p,q}(q+1) = P{p,oo}(q+1) + floor((p-1)/2) - floor((3+q(p-2))/2). In this case, p=8, q=6 and P{p,oo} = A389937.

%Y Cf. A393739, A393740, A393741, A393743, A393744, A389937.

%K nonn,more

%O 1,3

%A _John Mason_, Érika Roldán, and Rosemberg Toalá-Enríquez, Mar 02 2026