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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.

A270531 a(n) = Sum_{i=1..floor(n/2)} (i*(n-i))!.

Table of values

n a(n)
0 0
1 0
2 1
3 2
4 30
5 744
6 403320
7 482631120
8 22230943262640
9 2439304469060699520
10 16131709536027319923050880
11 265557748777251180632423132716800
12 382326737887135184960649117960539544556800
13 1405822033408121123332642294795422193345577766681600

List of values

[0, 0, 1, 2, 30, 744, 403320, 482631120, 22230943262640, 2439304469060699520, 16131709536027319923050880, 265557748777251180632423132716800, 382326737887135184960649117960539544556800, 1405822033408121123332642294795422193345577766681600]

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

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