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A012588 as a simple table

na(n)
00
11
22
30
4-24
5-132
640
78568
883328
9-44272
10-13222112
11-182425408
12173064320
1353699598912
14947897491840
15-1462598830976
16-450248068501504
17-9631043314112256
1821880384337367552
196765800654464927744
20169339160025954805760
21-532061075701090923520
22-165698959735673781516288

[0,1,2,0,-24,-132,40,8568,83328,-44272,-13222112,
 -182425408,173064320,53699598912,947897491840,
 -1462598830976,-450248068501504,-9631043314112256,
 21880384337367552,6765800654464927744,
 169339160025954805760,-532061075701090923520,
 -165698959735673781516288]