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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.

A028338 Triangle of coefficients in expansion of (x+1)*(x+3)*...*(x + 2n - 1) in rising powers of x.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 4
5 1
6 15
7 23
8 9
9 1
10 105
11 176
12 86
13 16
14 1
15 945
16 1689
17 950
18 230
19 25
20 1
21 10395
22 19524
23 12139
24 3480
25 505
26 36
27 1
28 135135
29 264207
30 177331
31 57379
32 10045
33 973
34 49
35 1
36 2027025
37 4098240
38 2924172
39 1038016
40 208054
41 24640
42 1708
43 64
44 1
45 34459425
46 71697105
47 53809164
48 20570444
49 4574934
50 626934
51 53676
52 2796
53 81
54 1

List of values

[1, 1, 1, 3, 4, 1, 15, 23, 9, 1, 105, 176, 86, 16, 1, 945, 1689, 950, 230, 25, 1, 10395, 19524, 12139, 3480, 505, 36, 1, 135135, 264207, 177331, 57379, 10045, 973, 49, 1, 2027025, 4098240, 2924172, 1038016, 208054, 24640, 1708, 64, 1, 34459425, 71697105, 53809164, 20570444, 4574934, 626934, 53676, 2796, 81, 1]