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A005447 as a simple table

na(n)
01
11
21
31
4-1
51
61
7-139
81
9-571
10-281
11163879
12-5221
135246819
145459
15-534703531
1691207079
17-4483131259
18-2650986803
19432261921612371
20-6171801683
216232523202521089
224283933145517
23-25834629665134204969
2411963983648109

[1,1,1,1,-1,1,1,-139,1,-571,-281,163879,-5221,
 5246819,5459,-534703531,91207079,-4483131259,
 -2650986803,432261921612371,-6171801683,
 6232523202521089,4283933145517,
 -25834629665134204969,11963983648109]