A390201 a(n) is the number of polyedges with n edges in the {4,5} tessellation of the hyperbolic plane.

1, 2, 8, 33, 187, 1117, 7355, 49958

Offset

1,2

Comments

A {4,5} polyedge is a connected graph made up of the edges of squares in the order-5 square tiling of the hyperbolic plane.

This sequence was calculated in the context of a project in collaboration with Érika Roldán, and Rosemberg Toalá-Enríquez.

Links

Table of n, a(n) for n=1..8.

Crossrefs

Cf. A119611, A019988.

Sequence in context: A030821 A393156 A236382 * A393725 A269890 A393726

Adjacent sequences: A390198 A390199 A390200 * A390202 A390203 A390204

Keyword

nonn,more

Author

John Mason, Nov 02 2025

Status

approved