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A051684 as a simple table

n a(n)
1 0
2 -1
3 -3
4 -3
5 5
6 15
7 -21
8 -133
9 27
10 1215
11 935
12 -12441
13 -23673
14 138047
15 469455
16 -1601265
17 -9112561
18 18108927
19 182135007
20 -161934625
21 -3804634785
22 -404007681
23 83297957567

[0,-1,-3,-3,5,15,-21,-133,27,1215,935,-12441,
 -23673,138047,469455,-1601265,-9112561,18108927,
 182135007,-161934625,-3804634785,-404007681,
 83297957567]

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Last modified December 8 01:46 EST 2019. Contains 329850 sequences. (Running on oeis4.)