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A047687 as a simple table

na(n)
01
11
21
30
4-1
5-1
6-1
71
831
91
10-2951
11-1
12181
132417
1458913
15-5699
16-52635599
17-19993
181126610929
193631
2027069353
21-6050353
22-118802490419
2347438
2411162375477471
2541478716501
26-8529964147714967
27-3818348299
28-2610006147952249
2936698180928319

[1,1,1,0,-1,-1,-1,1,31,1,-2951,-1,181,2417,58913,
 -5699,-52635599,-19993,1126610929,3631,27069353,
 -6050353,-118802490419,47438,11162375477471,
 41478716501,-8529964147714967,-3818348299,
 -2610006147952249,36698180928319]