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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.

A202253 Number of zero-sum -n..n arrays of 3 elements with adjacent element differences also in -n..n.

Table of values

n a(n)
1 3
2 9
3 17
4 27
5 41
6 57
7 75
8 97
9 121
10 147
11 177
12 209
13 243
14 281
15 321
16 363
17 409
18 457
19 507
20 561
21 617
22 675
23 737
24 801
25 867
26 937
27 1009
28 1083
29 1161
30 1241
31 1323
32 1409
33 1497
34 1587
35 1681
36 1777
37 1875
38 1977
39 2081
40 2187
41 2297
42 2409
43 2523
44 2641
45 2761
46 2883
47 3009
48 3137
49 3267

List of values

[3, 9, 17, 27, 41, 57, 75, 97, 121, 147, 177, 209, 243, 281, 321, 363, 409, 457, 507, 561, 617, 675, 737, 801, 867, 937, 1009, 1083, 1161, 1241, 1323, 1409, 1497, 1587, 1681, 1777, 1875, 1977, 2081, 2187, 2297, 2409, 2523, 2641, 2761, 2883, 3009, 3137, 3267]

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

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