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Table of n, a(n) for n=0..101.
Eric Weisstein's World of Mathematics, Circle Lattice Points.
Sequence in context: A104146 A193179 A133705 * A131779 A131775 A218825
Adjacent sequences: A046108 A046109 A046110 * A046112 A046113 A046114
Eric W. Weisstein