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A053456
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Open disk numbers (version 1): a(n)= number of points (i,j), i,j, integers, contained in a open disk of diameter n, centered at (0,0).
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4
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0, 1, 1, 9, 9, 21, 25, 37, 45, 69, 69, 97, 109, 137, 145, 177, 193, 225, 249, 293, 305, 349, 373, 421, 437, 489, 517, 577, 609, 665, 697, 749, 793, 861, 889, 973, 1005, 1085, 1125, 1201, 1245, 1313, 1369, 1457, 1513, 1597, 1649, 1741, 1789, 1885, 1941
(list; graph; refs; listen; history; internal format)
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