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.

A126328 Rounded value of n!/(n(n+1)/2); A000142(n)/A000217(n).

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 8
6 34
7 180
8 1120
9 8064
10 65978
11 604800
12 6141046
13 68428800
14 830269440
15 10897286400
16 153844043294
17 2324754432000
18 37440781904842
19 640237370572800
20 11585247657984000
21 221172909834240000
22 4442690623626907826

List of values

[1, 1, 1, 2, 8, 34, 180, 1120, 8064, 65978, 604800, 6141046, 68428800, 830269440, 10897286400, 153844043294, 2324754432000, 37440781904842, 640237370572800, 11585247657984000, 221172909834240000, 4442690623626907826]

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

Content is available under The OEIS End-User License Agreement.