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A012928 as a simple table

na(n)
01
10
2-4
36
4-19
520
626
7-1218
813021
9-123624
101277216
11-12476530
12142470545
13-1576920228
1420310039174
15-259802497290
163783797829145
17-55910099232336
18917432601399236
19-15504261990312618
20284553809208217365

[1,0,-4,6,-19,20,26,-1218,13021,-123624,1277216,
 -12476530,142470545,-1576920228,20310039174,
 -259802497290,3783797829145,-55910099232336,
 917432601399236,-15504261990312618,
 284553809208217365]