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A027641 as a simple table

n a(n)
0 1
1 -1
2 1
3 0
4 -1
5 0
6 1
7 0
8 -1
9 0
10 5
11 0
12 -691
13 0
14 7
15 0
16 -3617
17 0
18 43867
19 0
20 -174611
21 0
22 854513
23 0
24 -236364091
25 0
26 8553103
27 0
28 -23749461029
29 0
30 8615841276005
31 0
32 -7709321041217
33 0
34 2577687858367
35 0
36 -26315271553053477373
37 0
38 2929993913841559
39 0
40 -261082718496449122051

[1,-1,1,0,-1,0,1,0,-1,0,5,0,-691,0,7,0,-3617,0,
 43867,0,-174611,0,854513,0,-236364091,0,8553103,0,
 -23749461029,0,8615841276005,0,-7709321041217,0,
 2577687858367,0,-26315271553053477373,0,
 2929993913841559,0,-261082718496449122051]

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Last modified November 14 13:04 EST 2018. Contains 317185 sequences. (Running on oeis4.)