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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A267710 Number of unit triangular lattice cells enclosed by origin centered circle of diameter n.

Table of values

n a(n)
1 0
2 6
3 6
4 24
5 24
6 54
7 60
8 96
9 114
10 150
11 180
12 216
13 258
14 324
15 348
16 426
17 450
18 540
19 564
20 666
21 720
22 804
23 870
24 954
25 1056
26 1134
27 1230
28 1344
29 1416
30 1542
31 1614
32 1752
33 1842
34 1974
35 2100
36 2208
37 2346
38 2478
39 2628
40 2778
41 2898
42 3084
43 3180
44 3378
45 3474
46 3684
47 3822
48 4002
49 4176
50 4356

List of values

[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]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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