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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.

A224873 Triangle of coefficients T(n, k) (n > 0, k < n) in expansion of sin(u*x) * sin(v*x) / (cos(u*x) + cos(v*x)), read by rows.

Table of values

n a(n)
1 1
2 1
3 1
4 3
5 25
6 3
7 17
8 329
9 329
10 17
11 155
12 5325
13 14301
14 5325
15 155
16 2073
17 110605
18 563013
19 563013
20 110605
21 2073
22 38227
23 2918825
24 23904881
25 45956625
26 23904881
27 2918825
28 38227
29 929569
30 96075665
31 1150348017
32 3600524785
33 3600524785
34 1150348017
35 96075665
36 929569

List of values

[1, 1, 1, 3, 25, 3, 17, 329, 329, 17, 155, 5325, 14301, 5325, 155, 2073, 110605, 563013, 563013, 110605, 2073, 38227, 2918825, 23904881, 45956625, 23904881, 2918825, 38227, 929569, 96075665, 1150348017, 3600524785, 3600524785, 1150348017, 96075665, 929569]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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