0,2

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

Cf. A079843.

Sequence in context: A118871 A019494 A192886 * A080617 A080628 A225127

Adjacent sequences: A079841 A079842 A079843 * A079845 A079846 A079847

nonn,fini,full

N. J. A. Sloane, Feb 21 2003

approved