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A079761
Number of positions that are exactly n moves from the starting position in the 2 X 2 X 2 Rubik cube puzzle.
4
1, 9, 54, 321, 1847, 9992, 50136, 227536, 870072, 1887748, 623800, 2644
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 3674160. A half-turn is considered to be one move.
REFERENCES
D. R. Hofstadter, Metamagical Themas, Basic Books, NY, 1985, p. 359.
CROSSREFS
Sequence in context: A243415 A276602 A079764 * A115784 A037599 A037704
KEYWORD
nonn,fini,full
AUTHOR
N. J. A. Sloane, Feb 20 2003
STATUS
approved