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A053596 Open 3-dimensional ball numbers (version 4): a(n)= number of integer points (i,j,k) contained in a open ball of diameter n, centered at (1/2,1/2,1/2). 0
0, 0, 8, 8, 32, 56, 136, 160, 280, 360, 552, 672, 912, 1088, 1472, 1736, 2176, 2512, 3112, 3544, 4224, 4776, 5616, 6272, 7208, 8144, 9328, 10144, 11536, 12712, 14328, 15408, 17256, 18656, 20672, 22400, 24464, 26344, 28768, 30976, 33552 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n)/(n/2)^3->4/3*Pi

LINKS

Table of n, a(n) for n=0..40.

CROSSREFS

Sequence in context: A253104 A122858 A143336 * A141384 A183400 A111218

Adjacent sequences:  A053593 A053594 A053595 * A053597 A053598 A053599

KEYWORD

easy,nonn

AUTHOR

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 19 2000

STATUS

approved

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Last modified April 18 14:39 EDT 2019. Contains 322209 sequences. (Running on oeis4.)