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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.

A241688 Number of Sidon subsets of {1,...,n} of size 4.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 2
8 10
9 26
10 60
11 110
12 190
13 304
14 466
15 676
16 958
17 1312
18 1762
19 2310
20 2984
21 3786
22 4750
23 5874
24 7196
25 8720
26 10484
27 12488
28 14780
29 17360
30 20276
31 23530
32 27174
33 31210
34 35696
35 40630
36 46074
37 52032
38 58566
39 65676
40 73434
41 81840
42 90966
43 100814
44 111460
45 122906

List of values

[0, 0, 0, 0, 0, 0, 2, 10, 26, 60, 110, 190, 304, 466, 676, 958, 1312, 1762, 2310, 2984, 3786, 4750, 5874, 7196, 8720, 10484, 12488, 14780, 17360, 20276, 23530, 27174, 31210, 35696, 40630, 46074, 52032, 58566, 65676, 73434, 81840, 90966, 100814, 111460, 122906]

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

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