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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.

A247306 Array T(n,k) of the expected value of trace(O)^(2k), where O is an n X n orthogonal matrix randomly selected according to Haar measure, read by antidiagonals.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 3
6 1
7 1
8 3
9 10
10 1
11 1
12 3
13 15
14 35
15 1
16 1
17 3
18 15
19 91
20 126
21 1
22 1
23 3
24 15
25 105
26 603
27 462
28 1
29 1
30 3
31 15
32 105
33 903
34 4213
35 1716
36 1
37 1
38 3
39 15
40 105
41 945
42 8778
43 30537
44 6435
45 1
46 1
47 3
48 15
49 105
50 945
51 10263
52 92235
53 227475
54 24310
55 1

List of values

[1, 1, 1, 1, 3, 1, 1, 3, 10, 1, 1, 3, 15, 35, 1, 1, 3, 15, 91, 126, 1, 1, 3, 15, 105, 603, 462, 1, 1, 3, 15, 105, 903, 4213, 1716, 1, 1, 3, 15, 105, 945, 8778, 30537, 6435, 1, 1, 3, 15, 105, 945, 10263, 92235, 227475, 24310, 1]