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A183772 as a simple table

na(n)
10
21
31
40
56
60
712
840
940
1012
110
12280
130
14280
150
16160
172016
187392
197392
202016
21160
220
2314784
240
25205920
260
2714784
280
292240
30109824
311555840
325912192
335912192
341555840
35109824
362240
370
38823680
390
40173065984
410
42173065984
430
44823680
450
4632256
476223360

[0,1,1,0,6,0,12,40,40,12,0,280,0,280,0,160,2016,
 7392,7392,2016,160,0,14784,0,205920,0,14784,0,
 2240,109824,1555840,5912192,5912192,1555840,
 109824,2240,0,823680,0,173065984,0,173065984,0,
 823680,0,32256,6223360]