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A053457 Open disk numbers (version 2): a(n)= number of points (i,j), i,j, integers, contained in a open disk of diameter n, centered at (0,1/2). 1

%I

%S 0,0,2,6,12,16,26,38,48,60,78,94,108,128,154,174,196,224,250,278,312,

%T 344,378,410,452,484,526,574,612,652,698,754,800,848,906,958,1012,

%U 1068,1130,1190,1252,1316,1378,1446,1516,1588,1654,1730,1808,1880,1954

%N Open disk numbers (version 2): a(n)= number of points (i,j), i,j, integers, contained in a open disk of diameter n, centered at (0,1/2).

%C a(n)/(n/2)^2->Pi

%Y A053414, A053456-A053459.

%K easy,nonn

%O 0,3

%A Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 13 2000

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Last modified January 26 15:01 EST 2022. Contains 350599 sequences. (Running on oeis4.)