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A160480 as a simple table

na(n)
2-1
3-11
41
5-299
636
7-1
8-15371
92063
10-85
111
12-1285371
13182474
14-8948
15166
16-1
17-159158691
1823364725
19-1265182
2029034
21-287
221
23-27376820379
244107797216
25-237180483
266171928
27-77537
28456
29-1

[-1,-11,1,-299,36,-1,-15371,2063,-85,1,-1285371,
 182474,-8948,166,-1,-159158691,23364725,-1265182,
 29034,-287,1,-27376820379,4107797216,-237180483,
 6171928,-77537,456,-1]