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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.

A281964 Real part of n!*Sum_{k=1..n} i^(k-1)/k, where i is sqrt(-1).

Table of values

n a(n)
1 1
2 2
3 4
4 16
5 104
6 624
7 3648
8 29184
9 302976
10 3029760
11 29698560
12 356382720
13 5111976960
14 71567677440
15 986336870400
16 15781389926400
17 289206418636800
18 5205715535462400
19 92506221468057600
20 1850124429361152000
21 41285515024760832000
22 908281330544738304000

List of values

[1, 2, 4, 16, 104, 624, 3648, 29184, 302976, 3029760, 29698560, 356382720, 5111976960, 71567677440, 986336870400, 15781389926400, 289206418636800, 5205715535462400, 92506221468057600, 1850124429361152000, 41285515024760832000, 908281330544738304000]

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

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