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A013398 as a simple table

na(n)
01
10
20
3-1
40
5-7
610
7-47
8392
92809
1011814
11506893
12-403612
1383115485
14-231855494
1516349094305
16-65488668048
173986249084945
18-19019872358258
191200454846441429
20-6285428416936228
21441567328473394021

[1,0,0,-1,0,-7,10,-47,392,2809,11814,506893,
 -403612,83115485,-231855494,16349094305,
 -65488668048,3986249084945,-19019872358258,
 1200454846441429,-6285428416936228,
 441567328473394021]