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.

A221972 G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (2*k-1) / (1 + k*(2*k-1)*x).

Table of values

n a(n)
0 1
1 1
2 5
3 49
4 797
5 19417
6 661829
7 30067105
8 1755847661
9 128153307433
10 11430887275733
11 1223433282301681
12 154741998546660605
13 22833118232808363769
14 3887374029443206242917
15 756359660427618330221377
16 166781979021653656537782029
17 41372815623877107580771950025

List of values

[1, 1, 5, 49, 797, 19417, 661829, 30067105, 1755847661, 128153307433, 11430887275733, 1223433282301681, 154741998546660605, 22833118232808363769, 3887374029443206242917, 756359660427618330221377, 166781979021653656537782029, 41372815623877107580771950025]