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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.

A066643 a(n) = floor(Pi*n^2).

Table of values

n a(n)
0 0
1 3
2 12
3 28
4 50
5 78
6 113
7 153
8 201
9 254
10 314
11 380
12 452
13 530
14 615
15 706
16 804
17 907
18 1017
19 1134
20 1256
21 1385
22 1520
23 1661
24 1809
25 1963
26 2123
27 2290
28 2463
29 2642
30 2827
31 3019
32 3216
33 3421
34 3631
35 3848
36 4071
37 4300
38 4536
39 4778
40 5026
41 5281
42 5541
43 5808
44 6082
45 6361
46 6647

List of values

[0, 3, 12, 28, 50, 78, 113, 153, 201, 254, 314, 380, 452, 530, 615, 706, 804, 907, 1017, 1134, 1256, 1385, 1520, 1661, 1809, 1963, 2123, 2290, 2463, 2642, 2827, 3019, 3216, 3421, 3631, 3848, 4071, 4300, 4536, 4778, 5026, 5281, 5541, 5808, 6082, 6361, 6647]

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

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