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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 44100. Here we consider a move to be a quarter turn of a disc.
Table of n, a(n) for n=0..15.
Jaap Scherphuis, Puzzle Pages
Sequence in context: A118871 A019494 A192886 * A080617 A080628 A225127
Adjacent sequences: A079841 A079842 A079843 * A079845 A079846 A079847
N. J. A. Sloane, Feb 21 2003