A268666 Number of polycubes with n cells, allowing edge connections as well as face connections, identifying mirror images.

1, 2, 8, 64, 646, 9364, 151028, 2605148, 46350675

Offset: 1

Author

George Sicherman, Feb 10 2016

Keywords

• nonn
• more
• nice
• hard

Examples

			a(2) = 2 because there are two ways to join two cells in the cubic grid at faces or edges.
		

Links

• G. L. Sicherman, Catalogue of Polykedges.

Crossrefs

Cf. A270862 (distinguishing mirror images), A038119, A000162, A030222 (2-dimensional polyplets).

34th row of A366766.

Extensions

a(8)-a(9) from John Mason, Aug 04 2021