A392941 Number of fixed polyquoins with n cells.

1, 27, 1043, 47032, 2314562, 120490873, 6523277108

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. A001931, A390622, A392939 (free), A392940 (one-sided).

Sequence in context: A143705 A222440 A159457 * A290946 A223552 A357228

Adjacent sequences: A392938 A392939 A392940 * A392942 A392943 A392944

Keyword

nonn,more,hard

Author

John Mason, Jan 27 2026

Status

approved