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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.

A335627 Expansion of e.g.f. Product_{k>0} 1/(1-tan(x)^k).

Table of values

n a(n)
0 1
1 1
2 4
3 20
4 152
5 1216
6 13264
7 145760
8 2031872
9 28617856
10 480749824
11 8243878400
12 162085486592
13 3262756228096
14 73483961257984
15 1695754607421440
16 42992308610957312
17 1118097332524711936
18 31487163119164063744
19 910421423509984378880
20 28187970433553669292032
21 896242635855128514789376

List of values

[1, 1, 4, 20, 152, 1216, 13264, 145760, 2031872, 28617856, 480749824, 8243878400, 162085486592, 3262756228096, 73483961257984, 1695754607421440, 42992308610957312, 1118097332524711936, 31487163119164063744, 910421423509984378880, 28187970433553669292032, 896242635855128514789376]

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

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