OFFSET
0,2
COMMENTS
See A090573.
EXAMPLE
a(1)=5 because the empty space located at the center of a face of the combination cube in the assumed initial configuration can be replaced in the first move by either the cube from the center of the combination cube or by one of the 4 adjacent cubes located at the edges of the face initially containing the empty space.
PROG
moves = lambda p, shape: moves3d(p, shape)
start, shape = "1234-56789ABCDEFGHIJKLMNOPQ", (3, 3, 3)
print(alst(start, shape, maxd=12)) # Michael S. Branicky, Dec 28 2020
CROSSREFS
KEYWORD
fini,hard,more,nonn
AUTHOR
Hugo Pfoertner, Jan 15 2004
EXTENSIONS
a(13)-a(16) from Michael S. Branicky, Dec 28 2020
STATUS
approved