%N Number of polycubes with n cells, allowing edge connections as well as face connections, identifying mirror images.
%e a(2) = 2 because there are two ways to join two cells in the cubic grid at faces or edges.
%Y Cf. A270862 (distinguishing mirror images), A038119, A000162, A030222 (2-dimensional polyplets).
%A _George Sicherman_, Feb 10 2016