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A348468 as a simple table

na(n)
01
10
2-1
3-3
4-10
5-45
6-271
7-2058
8-18775
9-199335
10-2410516
11-32683563
12-490870315
13-8087188200
14-144994236661
15-2810079139143
16-58536519252130
17-1304198088413265
18-30946462816602331
19-779104979758256298
20-20742005411397108595
21-582214473250983046155
22-17184302765073000634276

[1,0,-1,-3,-10,-45,-271,-2058,-18775,-199335,
 -2410516,-32683563,-490870315,-8087188200,
 -144994236661,-2810079139143,-58536519252130,
 -1304198088413265,-30946462816602331,
 -779104979758256298,-20742005411397108595,
 -582214473250983046155,-17184302765073000634276]