Might be thought of as number of rooted (-1)-dimensional "polycubes" with n cells, with no symmetries removed.
Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
Table of n, a(n) for n=1..8.
R. C. Schroeppel, A few mathematical experiments
Cf. A094101, A048663-A048868.
Sequence in context: A216839 A024720 A289717 * A185897 A067297 A274394
Adjacent sequences: A094097 A094098 A094099 * A094101 A094102 A094103