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A215681 as a simple table

na(n)
01
10
20
3-3
40
5-10
690
7-308
81680
9-13560
10123480
11-788568
127646760
13-76432720
14841320480
15-8436217208
16103473901440
17-1320024546240
1817546621595840
19-235942960528128
203481689023521920
21-54132188358133120
22858287202343992960
23-14187715233218409728

[1,0,0,-3,0,-10,90,-308,1680,-13560,123480,
 -788568,7646760,-76432720,841320480,-8436217208,
 103473901440,-1320024546240,17546621595840,
 -235942960528128,3481689023521920,
 -54132188358133120,858287202343992960,
 -14187715233218409728]