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