OFFSET
0,3
COMMENTS
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 half-turn is considered to be 2 moves.
The total number of inequivalent positions is 901083404981813616. - Jerry Bryan, Mar 03 2003
REFERENCES
Robert G. Bryan (Jerry Bryan), postings to Cube Lovers List, Feb 04, 1995 and Oct 26, 1998.
LINKS
Alan Bawden, Cube Lovers Archive, Part 15
Alan Bawden, Cube Lovers Archive, Part 16
Alan Bawden, Cube Lovers Archive, Part 26
Tomas Rokicki, God's Number in the Quarter-Turn Metric
Tomas Rokicki, Symmetrical Positions
CROSSREFS
KEYWORD
nonn,fini
AUTHOR
N. J. A. Sloane, Feb 25 2003
EXTENSIONS
Added a(13)-a(18). This is based on a great deal of work by a large number of people; full links and credit are on cube20.org/qtm. The numbers were calculated by combining the God's number counts on the main page with the symmetric solution counts on the symmetry page. - Tomas Rokicki, Sep 01 2014
STATUS
approved