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A053594
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Open 3-dimensional ball numbers (version 2): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,0,0).
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0
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0, 0, 2, 10, 28, 60, 110, 174, 256, 368, 498, 682, 884, 1140, 1422, 1750, 2104, 2560, 3026, 3546, 4140, 4828, 5542, 6382, 7224, 8136, 9122, 10274, 11460, 12732, 14094, 15558, 17080, 18752, 20458, 22410, 24364, 26516, 28678, 31006, 33400
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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a(n)/(n/2)^3 - > (4/3)*Pi.
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LINKS
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 19 2000
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STATUS
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approved
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