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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.

A177381 G.f.: Sum_{n>=0} Product_{k=1..n} tan(k*arctan(x)).

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 26
5 142
6 930
7 7110
8 62138
9 610958
10 6674370
11 80201222
12 1051277530
13 14927729678
14 228262465634
15 3739557703366
16 65345926588026
17 1213197344607502
18 23848186328994178
19 494822251631023622
20 10807111342480752538

List of values

[1, 1, 2, 6, 26, 142, 930, 7110, 62138, 610958, 6674370, 80201222, 1051277530, 14927729678, 228262465634, 3739557703366, 65345926588026, 1213197344607502, 23848186328994178, 494822251631023622, 10807111342480752538]

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

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