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A349719 as a simple table

na(n)
01
11
20
31
4-4
526
6-212
72108
8-24720
9334072
10-5112544
1187396728
12-1650607040
1334132685120
14-767025716736
1518612106195456
16-485013257865472
1713509071081429888
18-400505695457942528
1912592502771190979712
20-418524228123134068224

[1,1,0,1,-4,26,-212,2108,-24720,334072,-5112544,
 87396728,-1650607040,34132685120,-767025716736,
 18612106195456,-485013257865472,13509071081429888,
 -400505695457942528,12592502771190979712,
 -418524228123134068224]