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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.

A348141 a(n) is the denominator of tan(n * arctan(1/n)).

Table of values

n a(n)
1 1
2 3
3 9
4 161
5 475
6 27755
7 60319
8 9722113
9 13913289
10 5707904499
11 5061910249
12 5039646554593
13 2665025213747
14 6237995487261915
15 1915304790146175
16 10303367499652761601
17 1801181048868783377
18 21891769059478538933603
19 2146451844926024801801
20 58162468900440912135124001

List of values

[1, 3, 9, 161, 475, 27755, 60319, 9722113, 13913289, 5707904499, 5061910249, 5039646554593, 2665025213747, 6237995487261915, 1915304790146175, 10303367499652761601, 1801181048868783377, 21891769059478538933603, 2146451844926024801801, 58162468900440912135124001]

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

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