A057656 Number of points (x,y) in square lattice with (x-1/2)^2+y^2 <= n.

2, 6, 8, 12, 16, 16, 22, 26, 26, 30, 34, 38, 40, 44, 44, 48, 56, 56, 60, 60, 62, 70, 74, 74, 78, 82, 82, 86, 90, 94, 96, 104, 104, 104, 108, 108, 116, 120, 124, 128, 128, 128, 134, 138, 138, 142, 150, 150, 154, 158, 158, 166, 166, 166, 166, 174

Offset: 0

Author

N. J. A. Sloane, Oct 15 2000

Keywords

• nonn

References

• J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 106.

Crossrefs

Partial sums of A004020. Cf. A057656, A057961, A057962.