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A000367 as a simple table

n a(n)
0 1
1 1
2 -1
3 1
4 -1
5 5
6 -691
7 7
8 -3617
9 43867
10 -174611
11 854513
12 -236364091
13 8553103
14 -23749461029
15 8615841276005
16 -7709321041217
17 2577687858367
18 -26315271553053477373
19 2929993913841559
20 -261082718496449122051

[1,1,-1,1,-1,5,-691,7,-3617,43867,-174611,854513,
 -236364091,8553103,-23749461029,8615841276005,
 -7709321041217,2577687858367,
 -26315271553053477373,2929993913841559,
 -261082718496449122051]

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Last modified February 24 06:13 EST 2018. Contains 299597 sequences. (Running on oeis4.)