A polytet or polytetrahedron is a solid formed by joining platonic tetrahedra face to face.
Table of n, a(n) for n=1..5.
G. L. Sicherman, Catalogue of Polytets
a(4) = 4 because four cells can be grouped around a common edge, or have each of three attached to the fourth, or be joined in series; and the last case has distinct mirror images.
Cf. A119602 (number of polytetrahedra allowing edge connections as well as face connections), A038168.
Sequence in context: A229338 A111443 A299118 * A331450 A051499 A333654
Adjacent sequences: A276269 A276270 A276271 * A276273 A276274 A276275
George Sicherman, Aug 26 2016