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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.

A249100 Triangular array read by rows: row n gives the coefficients of the polynomial p(n,x) defined in Comments.

Table of values

n a(n)
0 1
1 3
2 1
3 5
4 3
5 1
6 21
7 12
8 3
9 1
10 45
11 48
12 21
13 3
14 1
15 231
16 177
17 81
18 32
19 3
20 1
21 585
22 855
23 450
24 120
25 45
26 3
27 1
28 3465
29 3240
30 2070
31 930
32 165
33 60
34 3
35 1
36 9945
37 18000
38 10890
39 4110
40 1695
41 216
42 77
43 3
44 1
45 65835
46 71505
47 57330
48 28560
49 7245
50 2835
51 273
52 96
53 3
54 1
55 208845
56 443835
57 300195
58 143640
59 64155
60 11781
61 4452
62 336
63 117
64 3
65 1

List of values

[1, 3, 1, 5, 3, 1, 21, 12, 3, 1, 45, 48, 21, 3, 1, 231, 177, 81, 32, 3, 1, 585, 855, 450, 120, 45, 3, 1, 3465, 3240, 2070, 930, 165, 60, 3, 1, 9945, 18000, 10890, 4110, 1695, 216, 77, 3, 1, 65835, 71505, 57330, 28560, 7245, 2835, 273, 96, 3, 1, 208845, 443835, 300195, 143640, 64155, 11781, 4452, 336, 117, 3, 1]