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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.

A241209 a(n) = E(n) - E(n+1), where E(n) are the Euler numbers A122045(n).

Table of values

n a(n)
0 1
1 1
2 -1
3 -5
4 5
5 61
6 -61
7 -1385
8 1385
9 50521
10 -50521
11 -2702765
12 2702765
13 199360981
14 -199360981
15 -19391512145
16 19391512145
17 2404879675441
18 -2404879675441
19 -370371188237525
20 370371188237525
21 69348874393137901
22 -69348874393137901
23 -15514534163557086905

List of values

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

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

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