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A079817 Number of positions that are exactly n moves from the starting position in the Roundy puzzle. 1

%I

%S 1,9,54,261,919,1246,378,12

%N Number of positions that are exactly n moves from the starting position in the Roundy puzzle.

%C 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.

%C A puzzle in the Rubik cube family. The total number of distinct positions is 2880. Here we count half-turn moves.

%H Jaap Scherphuis, <a href="http://www.jaapsch.net/puzzles/">Puzzle Pages</a>

%Y Cf. A079742.

%K nonn,fini,full

%O 0,2

%A _N. J. A. Sloane_, Feb 20 2003

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Last modified October 21 23:13 EDT 2014. Contains 248381 sequences.