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.

A120487 Denominator of 1^n/n + 2^n/(n-1) + 3^n/(n-2) + ... + (n-1)^n/2 + n^n/1.

Table of values

n a(n)
1 1
2 2
3 3
4 12
5 5
6 20
7 35
8 280
9 63
10 2520
11 385
12 27720
13 6435
14 8008
15 45045
16 720720
17 85085
18 4084080
19 969969
20 739024
21 29393
22 5173168
23 7436429
24 356948592
25 42902475
26 2974571600
27 717084225
28 80313433200
29 215656441
30 2329089562800
31 4512611027925

List of values

[1, 2, 3, 12, 5, 20, 35, 280, 63, 2520, 385, 27720, 6435, 8008, 45045, 720720, 85085, 4084080, 969969, 739024, 29393, 5173168, 7436429, 356948592, 42902475, 2974571600, 717084225, 80313433200, 215656441, 2329089562800, 4512611027925]