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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.

A039599 Triangle formed from even-numbered columns of triangle of expansions of powers of x in terms of Chebyshev polynomials U_n(x).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 3
5 1
6 5
7 9
8 5
9 1
10 14
11 28
12 20
13 7
14 1
15 42
16 90
17 75
18 35
19 9
20 1
21 132
22 297
23 275
24 154
25 54
26 11
27 1
28 429
29 1001
30 1001
31 637
32 273
33 77
34 13
35 1
36 1430
37 3432
38 3640
39 2548
40 1260
41 440
42 104
43 15
44 1
45 4862
46 11934
47 13260
48 9996
49 5508
50 2244
51 663
52 135
53 17
54 1

List of values

[1, 1, 1, 2, 3, 1, 5, 9, 5, 1, 14, 28, 20, 7, 1, 42, 90, 75, 35, 9, 1, 132, 297, 275, 154, 54, 11, 1, 429, 1001, 1001, 637, 273, 77, 13, 1, 1430, 3432, 3640, 2548, 1260, 440, 104, 15, 1, 4862, 11934, 13260, 9996, 5508, 2244, 663, 135, 17, 1]