This is the number of positions that can be reached in n moves from the start, but which cannot be reached in fewer than n moves.
A puzzle in the Rubik cube family. The total number of distinct positions is 96.
Table of n, a(n) for n=0..7.
Jaap Scherphuis, Puzzle Pages
Sequence in context: A239708 A038588 A111041 * A160744 A160738 A028882
Adjacent sequences: A079827 A079828 A079829 * A079831 A079832 A079833
N. J. A. Sloane, Feb 20 2003