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.

A220231 G.f.: Sum_{n>=1} (2 - (1-x)^n) * (1 - (1-x)^n)^(n-1) / (1-x)^(n^2).

Table of values

n a(n)
0 1
1 4
2 22
3 184
4 2094
5 30300
6 532918
7 11041936
8 263451958
9 7114155240
10 214501732236
11 7143254501280
12 260397686968140
13 10313589262630724
14 441025376697310226
15 20250545724670230240
16 993756093394720170206
17 51903607891071021948092
18 2874779134773855301743682

List of values

[1, 4, 22, 184, 2094, 30300, 532918, 11041936, 263451958, 7114155240, 214501732236, 7143254501280, 260397686968140, 10313589262630724, 441025376697310226, 20250545724670230240, 993756093394720170206, 51903607891071021948092, 2874779134773855301743682]