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%I #12 Mar 23 2022 12:17:03
%S 0,1,1,9,9,21,25,37,45,69,69,97,109,137,145,177,193,225,249,293,305,
%T 349,373,421,437,489,517,577,609,665,697,749,793,861,889,973,1005,
%U 1085,1125,1201,1245,1313,1369,1457,1513,1597,1649,1741,1789,1885,1941
%N Open disk numbers (version 1): a(n) is the number of points (i,j), i,j, integers, contained in an open disk of diameter n, centered at (0,0).
%F a(n)/(n/2)^2->Pi.
%Y Cf. A053411, A053457, A053458, A053459.
%Y Bisections: A051132, A036704.
%Y Cf. A000796 (Pi).
%K easy,nonn
%O 0,4
%A Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 13 2000
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