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.

A213203 The sum of the first n! integers, with every n-th integer taken as negative.

Table of values

n a(n)
1 -1
2 -1
3 3
4 132
5 4260
6 172440
7 9069480
8 609618240
9 51209444160
10 5267273961600
11 651825357321600
12 95601055094899200
13 16405141092269529600
14 3257166195621552614400
15 741005309513165913216000

List of values

[-1, -1, 3, 132, 4260, 172440, 9069480, 609618240, 51209444160, 5267273961600, 651825357321600, 95601055094899200, 16405141092269529600, 3257166195621552614400, 741005309513165913216000]

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

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