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A013162 as a simple table

na(n)
00
12
2-1
3-4
418
5146
6-1425
7-7592
8210028
9559322
10-50827005
11106120692
1217584275654
13-154934766198
14-8006009893245
15152561646167328
164407064919207640
17-159846661630850958
18-2597264235213998553

[0,2,-1,-4,18,146,-1425,-7592,210028,559322,
 -50827005,106120692,17584275654,-154934766198,
 -8006009893245,152561646167328,4407064919207640,
 -159846661630850958,-2597264235213998553]