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For n = 1, the a(1) = 2 polyforms are the tetrahedron and the octahedron.
For n = 2, the a(2) = 1 polyform is a tetrahedron and an octahedron connected at a face.
For n = 3, there are a(3) = 4 polyforms with 3 cells:
- 3 consisting of one octahedron with two tetrahedra, and
- 1 consisting of two octahedra and one tetrahedron.
For n = 4, there are a(4) = 9 polyforms with 4 cells:
- 3 with one octahedron and three tetrahedra,
- 5 with two octahedra and three octahedra, and
- 1 with three octahedra and one tetrahedron.
For n = 5, there are a(5) = 44 polyforms with 5 cells:
- 6 with one octahedron and four tetrahedra,
- 24 with two octahedra and three tetrahedra,
- 13 with three octahedra and two tetrahedra, and
- 1 with four octahedra and one tetrahedron.
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