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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.

A194082 Sum{floor(sqrt(3)*k/2) : 1<=k<=n}.

Table of values

n a(n)
1 0
2 1
3 3
4 6
5 10
6 15
7 21
8 27
9 34
10 42
11 51
12 61
13 72
14 84
15 96
16 109
17 123
18 138
19 154
20 171
21 189
22 208
23 227
24 247
25 268
26 290
27 313
28 337
29 362
30 387
31 413
32 440
33 468
34 497
35 527
36 558
37 590
38 622
39 655
40 689
41 724
42 760
43 797
44 835
45 873
46 912
47 952
48 993
49 1035
50 1078
51 1122
52 1167
53 1212

List of values

[0, 1, 3, 6, 10, 15, 21, 27, 34, 42, 51, 61, 72, 84, 96, 109, 123, 138, 154, 171, 189, 208, 227, 247, 268, 290, 313, 337, 362, 387, 413, 440, 468, 497, 527, 558, 590, 622, 655, 689, 724, 760, 797, 835, 873, 912, 952, 993, 1035, 1078, 1122, 1167, 1212]

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

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