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A079817
Number of positions that are exactly n moves from the starting position in the Roundy puzzle.
1
1, 9, 54, 261, 919, 1246, 378, 12
OFFSET
0,2
COMMENTS
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 2880. Here we count half-turn moves.
CROSSREFS
Cf. A079742.
Sequence in context: A327387 A282920 A023008 * A169796 A359722 A027472
KEYWORD
nonn,fini,full
AUTHOR
N. J. A. Sloane, Feb 20 2003
STATUS
approved