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.

A009775 Exponential generating function is tanh(log(1+x)).

Table of values

n a(n)
0 0
1 1
2 -1
3 0
4 6
5 -30
6 90
7 0
8 -2520
9 22680
10 -113400
11 0
12 7484400
13 -97297200
14 681080400
15 0
16 -81729648000
17 1389404016000
18 -12504636144000
19 0
20 2375880867360000
21 -49893498214560000
22 548828480360160000
23 0
24 -151476660579404160000

List of values

[0, 1, -1, 0, 6, -30, 90, 0, -2520, 22680, -113400, 0, 7484400, -97297200, 681080400, 0, -81729648000, 1389404016000, -12504636144000, 0, 2375880867360000, -49893498214560000, 548828480360160000, 0, -151476660579404160000]

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

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