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A001896 as a simple table

n a(n)
0 1
1 -1
2 7
3 -31
4 127
5 -2555
6 1414477
7 -57337
8 118518239
9 -5749691557
10 91546277357
11 -1792042792463
12 1982765468311237
13 -286994504449393
14 3187598676787461083
15 -4625594554880206790555
16 16555640865486520478399
17 -22142170099387402072897

[1,-1,7,-31,127,-2555,1414477,-57337,118518239,
 -5749691557,91546277357,-1792042792463,
 1982765468311237,-286994504449393,
 3187598676787461083,-4625594554880206790555,
 16555640865486520478399,-22142170099387402072897]

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Last modified March 23 04:46 EDT 2019. Contains 321422 sequences. (Running on oeis4.)