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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.

A280793 E.g.f. A(x) satisfies: A( arctan( A( arctanh(x) ) ) ) = x.

Table of values

n a(n)
1 1
2 -4
3 1616
4 -10233664
5 605781862656
6 -195074044306023424
7 226963189334487889924096
8 -745095268828143694162593398784
9 5876637899238904537105181354518183936
10 -99252790021186158091252679600581668608671744
11 3289325814605557759161838756845047127645003816370176
12 -199648823584758446510667095055905800597628128606583525474304

List of values

[1, -4, 1616, -10233664, 605781862656, -195074044306023424, 226963189334487889924096, -745095268828143694162593398784, 5876637899238904537105181354518183936, -99252790021186158091252679600581668608671744, 3289325814605557759161838756845047127645003816370176, -199648823584758446510667095055905800597628128606583525474304]

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

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