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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.

A193544 E.g.f.: sqrt(2)*(L/Pi) / (1 + 2*Sum_{n>=1} cosh(2*Pi*n*x/L)/cosh(n*Pi)) where L = Lemniscate constant.

Table of values

n a(n)
0 1
1 -1
2 -3
3 27
4 441
5 -11529
6 -442827
7 23444883
8 1636819569
9 -145703137041
10 -16106380394643
11 2164638920874507
12 347592265948756521
13 -65724760945840254489
14 -14454276753061349098587
15 3658147171522531111996803
16 1055646229815910768764248289

List of values

[1, -1, -3, 27, 441, -11529, -442827, 23444883, 1636819569, -145703137041, -16106380394643, 2164638920874507, 347592265948756521, -65724760945840254489, -14454276753061349098587, 3658147171522531111996803, 1055646229815910768764248289]

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

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