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A009389 as a simple table

n a(n)
0 0
1 1
2 -1
3 3
4 -4
5 5
6 -1
7 7
8 -64
9 9
10 1319
11 11
12 -49204
13 13
14 2653559
15 15
16 -196707424
17 17
18 19194804719
19 19
20 -2385684870724
21 21
22 367985503366799
23 23
24 -68980888889771104
25 25
26 15445553274667315799
27 27
28 -4071626956018456576564
29 29

[0,1,-1,3,-4,5,-1,7,-64,9,1319,11,-49204,13,
 2653559,15,-196707424,17,19194804719,19,
 -2385684870724,21,367985503366799,23,
 -68980888889771104,25,15445553274667315799,27,
 -4071626956018456576564,29]

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Last modified September 19 17:19 EDT 2021. Contains 347564 sequences. (Running on oeis4.)