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A243993 as a simple table

na(n)
00
1-1
22684
3505
422
5-1
6109
75000005
8-1
9-1
10-1
11-1
12101
13-1
14-1
1550005
16-1
17-1
18-1
19-1
2020000
21-1
22-1
23-1
24100012
25-1
26-1
27-1
284999449
29-1
30-1
315000000000000000000000000000005
32-1

[0,-1,2684,505,22,-1,109,5000005,-1,-1,-1,-1,101,
 -1,-1,50005,-1,-1,-1,-1,20000,-1,-1,-1,100012,-1,
 -1,-1,4999449,-1,-1,
 5000000000000000000000000000005,-1]