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A009054 as a simple table

n a(n)
0 1
1 -1
2 1
3 47
4 -895
5 31
6 1002497
7 -53580465
8 -8587007
9 305732208959
10 -30437638147583
11 -144862063593105
12 545283874522872193
13 -85823970766230251681
14 -801780964397998270975
15 3637965188578615382687887

[1,-1,1,47,-895,31,1002497,-53580465,-8587007,
 305732208959,-30437638147583,-144862063593105,
 545283874522872193,-85823970766230251681,
 -801780964397998270975,3637965188578615382687887]

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Last modified April 20 09:59 EDT 2019. Contains 322309 sequences. (Running on oeis4.)