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.

A335257 Numerators of expansion of arctanh(tan(x)) (odd powers only).

Table of values

n a(n)
1 1
2 2
3 2
4 244
5 554
6 202084
7 166324
8 1594887848
9 456270874
10 9619518701764
11 59259390118004
12 554790995145103208
13 954740563911205348
14 32696580074344991138888
15 3636325637469705598456
16 7064702291984369672858925136
17 4176926860695042104392112698

List of values

[1, 2, 2, 244, 554, 202084, 166324, 1594887848, 456270874, 9619518701764, 59259390118004, 554790995145103208, 954740563911205348, 32696580074344991138888, 3636325637469705598456, 7064702291984369672858925136, 4176926860695042104392112698]

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

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