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A053595 Open 3-dimensional ball numbers (version 3): a(n)= number of integer points (i,j,k) contained in a open ball of diameter n, centered at (1/2,1/2,0). 0
0, 0, 4, 12, 36, 56, 112, 168, 268, 372, 536, 680, 888, 1132, 1452, 1740, 2160, 2544, 3048, 3556, 4196, 4812, 5552, 6304, 7248, 8116, 9220, 10280, 11512, 12656, 14108, 15564, 17164, 18800, 20664, 22368, 24436, 26412, 28692, 30984, 33536 (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: A200541 A149318 A233181 * A300553 A062858 A095735

Adjacent sequences:  A053592 A053593 A053594 * A053596 A053597 A053598

KEYWORD

easy,nonn

AUTHOR

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

STATUS

approved

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Last modified October 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)