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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.

A329708 Triangle, read by rows, where the n-th row lists the (2n+1) coefficients of (1+2*x+...+(n+1)*x^n)^2.

Table of values

n a(n)
0 1
1 1
2 4
3 4
4 1
5 4
6 10
7 12
8 9
9 1
10 4
11 10
12 20
13 25
14 24
15 16
16 1
17 4
18 10
19 20
20 35
21 44
22 46
23 40
24 25
25 1
26 4
27 10
28 20
29 35
30 56
31 70
32 76
33 73
34 60
35 36
36 1
37 4
38 10
39 20
40 35
41 56
42 84
43 104
44 115
45 116
46 106
47 84
48 49
49 1
50 4
51 10
52 20
53 35
54 56
55 84
56 120
57 147
58 164
59 170
60 164
61 145
62 112
63 64

List of values

[1, 1, 4, 4, 1, 4, 10, 12, 9, 1, 4, 10, 20, 25, 24, 16, 1, 4, 10, 20, 35, 44, 46, 40, 25, 1, 4, 10, 20, 35, 56, 70, 76, 73, 60, 36, 1, 4, 10, 20, 35, 56, 84, 104, 115, 116, 106, 84, 49, 1, 4, 10, 20, 35, 56, 84, 120, 147, 164, 170, 164, 145, 112, 64]