A390204 Number of {4,5} polyominoes of size n for which there exists at least one closed path that passes through each square exactly once.

0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 2, 1, 0, 7, 2, 1, 26, 16, 5, 128

Offset

1,11

Comments

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..20.

Crossrefs

Cf. A119611, A361288.

Sequence in context: A187197 A375368 A174869 * A330862 A269158 A109971

Adjacent sequences: A390201 A390202 A390203 * A390205 A390206 A390207

Keyword

nonn,more

Author

John Mason, Nov 03 2025

Status

approved