A392940 Number of one-sided polyquoins with n cells.

1, 3, 54, 2030, 96853, 5023549, 271823709

Offset

1,2

Comments

A polyquoin (term coined by George Sicherman) is like a polycube, but the cells can be joined across a complete, half or quarter-face, like a three-dimensional polynar.

Links

Table of n, a(n) for n=1..7.

George Sicherman, Catalogue of Polyquoins.

Crossrefs

Cf. A000162, A390621, A392939 (free), A392941 (fixed).

Sequence in context: A157550 A224368 A091826 * A091796 A171213 A006025

Adjacent sequences: A392937 A392938 A392939 * A392941 A392942 A392943

Keyword

nonn,more,hard

Author

John Mason, Jan 27 2026

Status

approved