OFFSET
0,28
COMMENTS
See A343640 for more information about this 3D generalization of the 2D Ulam type square spiral.
The sequence can be seen as a table with row lengths A010014, where A010014(r) is the number of points of Z^3 with sup-norm r.
The graph of this sequence oscillates with increasing amplitude and wave length.
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 0..9260
PROG
CROSSREFS
Cf. A010014 (number of points on a shell with given radius => row lengths).
KEYWORD
sign,tabf
AUTHOR
M. F. Hasler, Apr 28 2021
STATUS
approved