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A009548 as a simple table

na(n)
00
12
20
3-32
4-1984
5-118016
6-8529920
7-754714880
8-79868821504
9-9749056634880
10-1296267479826432
11-165153529347768320
12-9993013885707223040
137114872804447958401024
145975166564856692622753792

[0,2,0,-32,-1984,-118016,-8529920,-754714880,
 -79868821504,-9749056634880,-1296267479826432,
 -165153529347768320,-9993013885707223040,
 7114872804447958401024,5975166564856692622753792]