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.

A221160 G.f.: Sum_{n>=0} (4*n+1)^n * x^n / (1 + (4*n+1)*x)^n.

Table of values

n a(n)
0 1
1 5
2 56
3 864
4 16896
5 399360
6 11059200
7 350945280
8 12551454720
9 499415777280
10 21879167385600
11 1046394961920000
12 54245114825932800
13 3029690116944691200
14 181363518724689100800
15 11583863454028529664000
16 786298610212845649920000
17 56523637237014847291392000

List of values

[1, 5, 56, 864, 16896, 399360, 11059200, 350945280, 12551454720, 499415777280, 21879167385600, 1046394961920000, 54245114825932800, 3029690116944691200, 181363518724689100800, 11583863454028529664000, 786298610212845649920000, 56523637237014847291392000]