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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.

A058057 Triangle giving coefficients of ménage hit polynomials.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 0
6 1
7 3
8 1
9 1
10 1
11 6
12 6
13 8
14 3
15 1
16 10
17 20
18 38
19 35
20 16
21 1
22 15
23 50
24 134
25 213
26 211
27 96
28 1
29 21
30 105
31 385
32 915
33 1479
34 1459
35 675
36 1
37 28
38 196
39 952
40 3130
41 7324
42 11692
43 11584
44 5413
45 1
46 36
47 336
48 2100
49 9090
50 28764
51 65784
52 104364
53 103605
54 48800

List of values

[1, 1, 0, 1, 1, 0, 1, 3, 1, 1, 1, 6, 6, 8, 3, 1, 10, 20, 38, 35, 16, 1, 15, 50, 134, 213, 211, 96, 1, 21, 105, 385, 915, 1479, 1459, 675, 1, 28, 196, 952, 3130, 7324, 11692, 11584, 5413, 1, 36, 336, 2100, 9090, 28764, 65784, 104364, 103605, 48800]