OFFSET
1,2
COMMENTS
The next term a(4) is at least 64. From an extrapolation of Dave Boll's numerical results a(4)~=66 and a(5)~=141 are estimated values for the next terms.
LINKS
Dave Boll, Optimal Packing of Circles and Spheres
Hugo Pfoertner, Densest Packings of Equal Spheres in a Cube
EXAMPLE
a(3)=27 because there is no known better arrangement than the 3*3*3 cubic one that would allow packing more than 27 spheres into a cube of edge length 3.
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Hugo Pfoertner, Jun 12 2003
EXTENSIONS
a(4) from Hugo Pfoertner, May 21 2011
Replaced dead link to Dave Boll's web page and added link to visualization web page by Hugo Pfoertner, May 21 2011
STATUS
approved