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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.

A136515 Number of unit square lattice cells inside half-plane (two adjacent quadrants) of origin centered circle of diameter 2n+1.

Table of values

n a(n)
0 0
1 2
2 6
3 12
4 26
5 38
6 56
7 74
8 96
9 128
10 154
11 188
12 220
13 262
14 304
15 344
16 398
17 452
18 506
19 562
20 616
21 686
22 754
23 824
24 894
25 976
26 1056
27 1134
28 1224
29 1308
30 1406
31 1500
32 1592
33 1694
34 1804
35 1914
36 2026
37 2136
38 2258
39 2374
40 2504
41 2626
42 2756
43 2892
44 3022
45 3164
46 3300
47 3450
48 3600

List of values

[0, 2, 6, 12, 26, 38, 56, 74, 96, 128, 154, 188, 220, 262, 304, 344, 398, 452, 506, 562, 616, 686, 754, 824, 894, 976, 1056, 1134, 1224, 1308, 1406, 1500, 1592, 1694, 1804, 1914, 2026, 2136, 2258, 2374, 2504, 2626, 2756, 2892, 3022, 3164, 3300, 3450, 3600]

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

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