A119870 - OEIS

A119870

Number of vertices of the root-n Waterman polyhedron.

12, 6, 24, 12, 24, 32, 48, 54, 36, 24, 48, 24, 72, 72, 48, 60, 48, 54, 72, 72, 72, 72, 48, 56, 132, 96, 120, 96, 72, 72, 96, 102, 96, 96, 120, 84, 120, 144, 96, 72, 120, 72, 168, 168, 120, 120, 144, 168, 108, 126, 168, 72, 144, 152, 144, 144, 192, 120, 144, 144

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OFFSET

1,1

COMMENTS

The root-n Waterman polyhedron is the convex hull of the intersection of a closed ball of radius sqrt(2*n) with the lattice of sphere-center points of a cubic close packing. [Probably the f.c.c. lattice is intended here. - N. J. A. Sloane, Aug 09 2006]

The basic sphere center series of Waterman polyhedra is obtained by choosing a sphere center as the center of the closed ball. Other choices are possible. An example is given in A119874 ... A119878. For n in A055039 no lattice points are hit; the corresponding polyhedra are the same as for n-1.

LINKS

Table of n, a(n) for n=1..60.

CROSSREFS

Cf. A119870, A119875 [vertices of void-centered Waterman polyhedron].

Cf. A055039 [missing polyhedra]. Properties of Waterman polyhedra: A119870 [vertices], A119871 [faces], A119872 [edges], A119873 [volume]. Waterman polyhedra with different center: A119874, A119875, A119876, A119877, A119878.

Sequence in context: A173853 A040135 A004015 * A234516 A177690 A038332

Adjacent sequences: A119867 A119868 A119869 * A119871 A119872 A119873

KEYWORD

nonn

AUTHOR

Hugo Pfoertner, May 26 2006

STATUS

approved