0,5

Equivalence classes of bodies defined by n connected, regular, same-size, non-overlapping tetrahedra. Connected tetrahedra share an equilateral triangular face. Non-equivalent clusters cannot be made the same by rotations, translations or reflections.

R. J. Mathar, tetclust: constructive enumeration of clusters of regular tetrahedra. zenodo:18746289 (2026)

Cf. A038119 (construction with cubes).

Sequence in context: A366694 A100964 A080077 * A096318 A373608 A299404

Adjacent sequences: A393784 A393785 A393786 * A393789 A393790 A393791

nonn,more

R. J. Mathar, Feb 27 2026

approved