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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.

A193702 T(n,k)=Number of arrays of -k..k integers x(1..n) with every x(i) being in a subsequence of length 1, 2 or 3 with sum zero.

Table of values

n a(n)
1 1
2 1
3 3
4 1
5 5
6 9
7 1
8 7
9 23
10 23
11 1
12 9
13 43
14 83
15 57
16 1
17 11
18 69
19 181
20 299
21 141
22 1
23 13
24 101
25 317
26 827
27 1081
28 351
29 1
30 15
31 139
32 491
33 1741
34 3773
35 3931
36 875
37 1
38 17
39 183
40 703
41 3141
42 9385
43 17197
44 14293
45 2181
46 1
47 19
48 233
49 953
50 5127
51 19301
52 50035
53 78407
54 51955
55 5435
56 1
57 21
58 289
59 1241

List of values

[1, 1, 3, 1, 5, 9, 1, 7, 23, 23, 1, 9, 43, 83, 57, 1, 11, 69, 181, 299, 141, 1, 13, 101, 317, 827, 1081, 351, 1, 15, 139, 491, 1741, 3773, 3931, 875, 1, 17, 183, 703, 3141, 9385, 17197, 14293, 2181, 1, 19, 233, 953, 5127, 19301, 50035, 78407, 51955, 5435, 1, 21, 289, 1241]