1,2

a(4) is an experimental value. From an extrapolation of Dave Boll's results a supposed range for a(5) is between 65 and 70.

Dave Boll, Optimal Packing Of Circles And Spheres

Hugo Pfoertner, Numerical results for best packing of spheres in sphere.

Cf. A084827, A084829, A084825.

Sequence in context: A108660 A107132 A106959 this_sequence A100512 A051474 A062708

Adjacent sequences: A084825 A084826 A084827 this_sequence A084829 A084830 A084831

hard,more,nonn

Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 12 2003