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A013495 as a simple table

na(n)
01
10
21
3-4
49
5-48
6385
7-2420
817297
9-170688
101760289
11-18395012
12219987801
13-2936841776
1440948952993
15-606801250484
169752505856033
17-166636197964032
182990053004436417
19-56703580249101188

[1,0,1,-4,9,-48,385,-2420,17297,-170688,1760289,
 -18395012,219987801,-2936841776,40948952993,
 -606801250484,9752505856033,-166636197964032,
 2990053004436417,-56703580249101188]