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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 588. Here positions differing by rotations or reflections are considered the same.
Table of n, a(n) for n=0..24.
Jaap Scherphuis, Puzzle Pages
Sequence in context: A090178 A080548 A194450 * A229093 A064985 A090631
Adjacent sequences: A080553 A080554 A080555 * A080557 A080558 A080559
N. J. A. Sloane, Feb 21 2003