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%I #8 Mar 23 2022 12:51:19
%S 0,0,4,12,36,56,112,168,268,372,536,680,888,1132,1452,1740,2160,2544,
%T 3048,3556,4196,4812,5552,6304,7248,8116,9220,10280,11512,12656,14108,
%U 15564,17164,18800,20664,22368,24436,26412,28692,30984,33536
%N Open 3-dimensional ball numbers (version 3): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,1/2,0).
%C a(n)/(n/2)^3 -> (4/3)*Pi.
%K easy,nonn
%O 0,3
%A Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 19 2000
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