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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.

A028296 Expansion of e.g.f. Gudermannian(x) = 2*arctan(exp(x)) - Pi/2.

Table of values

n a(n)
0 1
1 -1
2 5
3 -61
4 1385
5 -50521
6 2702765
7 -199360981
8 19391512145
9 -2404879675441
10 370371188237525
11 -69348874393137901
12 15514534163557086905
13 -4087072509293123892361
14 1252259641403629865468285
15 -441543893249023104553682821
16 177519391579539289436664789665

List of values

[1, -1, 5, -61, 1385, -50521, 2702765, -199360981, 19391512145, -2404879675441, 370371188237525, -69348874393137901, 15514534163557086905, -4087072509293123892361, 1252259641403629865468285, -441543893249023104553682821, 177519391579539289436664789665]

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

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