Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
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 44100. Here we consider a move to be a quarter turn of a disc.
Table of n, a(n) for n=0..15.
Jaap Scherphuis, Puzzle Pages
Sequence in context: A118871 A019494 A192886 * A080617 A080628 A225127
Adjacent sequences: A079841 A079842 A079843 * A079845 A079846 A079847
N. J. A. Sloane, Feb 21 2003