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 4961250. Here we consider a move to be a quarter turn of a disc.

Table of n, a(n) for n=0..23.

Jaap Scherphuis, Puzzle Pages

Cf. A079857.

Sequence in context: A232534 A062422 A266465 * A131045 A182555 A026721

Adjacent sequences: A079861 A079862 A079863 * A079865 A079866 A079867

nonn,fini,full

N. J. A. Sloane, Feb 21 2003

approved