A393722 Number of free polyominoes in the {3,8} tessellation of the hyperbolic plane.

1, 1, 1, 3, 4, 12, 27, 82, 224, 708, 2158, 6950, 22315, 73221, 241386, 804944, 2699671, 9121604, 30986147, 105843040, 363233296, 1252126688

Offset

1,4

Links

Table of n, a(n) for n=1..22.

Wikipedia, Order 8 triangular tiling.

Prog

(C) // See A393739.

Crossrefs

Cf. A330659, A000207.

Sequence in context: A255436 A197459 A330659 * A000207 A002986 A147569

Adjacent sequences: A393719 A393720 A393721 * A393723 A393724 A393725

Keyword

nonn,more,changed

Author

John Mason, Érika Roldán, and Rosemberg Toalá-Enríquez, Feb 26 2026

Extensions

a(19)-a(22) from Ed Wynn, Jul 20 2026

Status

approved