A267710 Number of unit triangular lattice cells enclosed by origin centered circle of diameter n.
0, 6, 6, 24, 24, 54, 60, 96, 114, 150, 180, 216, 258, 324, 348, 426, 450, 540, 564, 666, 720, 804, 870, 954, 1056, 1134, 1230, 1344, 1416, 1542, 1614, 1752, 1842, 1974, 2100, 2208, 2346, 2478, 2628, 2778, 2898, 3084, 3180, 3378, 3474, 3684, 3822, 4002, 4176, 4356
Offset: 1
Links
- Luca Petrone, Table of n, a(n) for n = 1..200
Crossrefs
Cf. A093602 (Pi/sqrt(3)).
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