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A006838 as a simple table

n a(n)
2 0
3 0
4 1
5 0
6 0
7 4
8 0
9 -1
10 0
11 28
12 -1
13 -118
14 294
15 -184
16 -441
17 1486
18 -273
19 -6464
20 8969

[0,0,1,0,0,4,0,-1,0,28,-1,-118,294,-184,-441,1486,
 -273,-6464,8969]

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)