cp's OEIS Frontend

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.

A247239 Array a(n,m) = ((n+2)/2)^m*Sum_{k=1..n+1} 1/sin(k*Pi/(n+2))^(2m), n>=0, k>=0, read by ascending antidiagonals.

Table of values

n a(n)
0 1
1 2
2 1
3 3
4 4
5 1
6 4
7 10
8 8
9 1
10 5
11 20
12 36
13 16
14 1
15 6
16 35
17 120
18 136
19 32
20 1
21 7
22 56
23 329
24 800
25 528
26 64
27 1
28 8
29 84
30 784
31 3611
32 5600
33 2080
34 128
35 1
36 9
37 120
38 1680
39 13328
40 42065
41 40000
42 8256
43 256
44 1
45 10
46 165
47 3312
48 42048
49 241472
50 499955
51 288000
52 32896
53 512
54 1

List of values

[1, 2, 1, 3, 4, 1, 4, 10, 8, 1, 5, 20, 36, 16, 1, 6, 35, 120, 136, 32, 1, 7, 56, 329, 800, 528, 64, 1, 8, 84, 784, 3611, 5600, 2080, 128, 1, 9, 120, 1680, 13328, 42065, 40000, 8256, 256, 1, 10, 165, 3312, 42048, 241472, 499955, 288000, 32896, 512, 1]