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A015139 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 -15
5 1
6 1
7 241
8 241
9 1
10 1
11 -3855
12 61937
13 -3855
14 1
15 1
16 61681
17 15852017
18 15852017
19 61681
20 1
21 1
22 -986895
23 4058178033
24 -64914009615
25 4058178033
26 -986895
27 1
28 1
29 15790321
30 1038892589553
31 265891841561073
32 265891841561073

[1,1,1,1,-15,1,1,241,241,1,1,-3855,61937,-3855,1,
 1,61681,15852017,15852017,61681,1,1,-986895,
 4058178033,-64914009615,4058178033,-986895,1,1,
 15790321,1038892589553,265891841561073,
 265891841561073]

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Last modified January 21 19:08 EST 2019. Contains 319350 sequences. (Running on oeis4.)