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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.

A101418 Floor of the area of a lens constructed using circular arcs of radius n.

Table of values

n a(n)
1 1
2 4
3 11
4 19
5 30
6 44
7 60
8 78
9 99
10 122
11 148
12 176
13 207
14 240
15 276
16 314
17 354
18 397
19 443
20 491
21 541
22 594
23 649
24 707
25 767
26 830
27 895
28 963
29 1033
30 1105
31 1180
32 1257
33 1337
34 1419
35 1504
36 1591
37 1681
38 1773
39 1868
40 1965
41 2064
42 2166
43 2271
44 2378
45 2487
46 2599
47 2713
48 2830
49 2949

List of values

[1, 4, 11, 19, 30, 44, 60, 78, 99, 122, 148, 176, 207, 240, 276, 314, 354, 397, 443, 491, 541, 594, 649, 707, 767, 830, 895, 963, 1033, 1105, 1180, 1257, 1337, 1419, 1504, 1591, 1681, 1773, 1868, 1965, 2064, 2166, 2271, 2378, 2487, 2599, 2713, 2830, 2949]

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

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