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A152169
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Number of positions that are exactly n moves from the starting position in the 2 X 2 X 2 Rubik cube puzzle using only one-way quarter moves.
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0
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1, 3, 9, 27, 78, 216, 583, 1546, 4035, 10320, 25824, 62832, 146322, 321876, 635632, 988788, 958176, 450280, 66420, 1192
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| A half-turn is considered to be two moves. The one-way quarter move method has historically being disregarded because of the mechanics of the Rubik's cube. It fills still the complete configuration space with the minimum set of generators.
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CROSSREFS
| Cf. A079761, A079762
Sequence in context: A027027 A140348 A139561 * A006810 A090401 A181137
Adjacent sequences: A152166 A152167 A152168 * A152170 A152171 A152172
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KEYWORD
| fini,full,nonn
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AUTHOR
| Alejandro Lorca (alejandro.lorca(AT)fdi.ucm.es), Nov 27 2008
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