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A015123 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 -9
5 1
6 1
7 91
8 91
9 1
10 1
11 -909
12 9191
13 -909
14 1
15 1
16 9091
17 918191
18 918191
19 9091
20 1
21 1
22 -90909
23 91828191
24 -917272809
25 91828191
26 -90909
27 1
28 1
29 909091
30 9182728191
31 917364637191
32 917364637191
33 9182728191
34 909091
35 1
36 1
37 -9090909
38 918273728191

[1,1,1,1,-9,1,1,91,91,1,1,-909,9191,-909,1,1,9091,
 918191,918191,9091,1,1,-90909,91828191,-917272809,
 91828191,-90909,1,1,909091,9182728191,
 917364637191,917364637191,9182728191,909091,1,1,
 -9090909,918273728191]

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