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A137946 as a simple table

na(n)
11
20
30
46
50
612
70
8108
9108
100
11720
12720
130
147920
1511160
163240
170
1890720
19136080
2045360
210
221300320
232222640
241058400
25136080
260
2720563200
2837376640
2920079360
303265920
310
32372314880
33726667200
34453146400
35106142400
367348320

[1,0,0,6,0,12,0,108,108,0,720,720,0,7920,11160,
 3240,0,90720,136080,45360,0,1300320,2222640,
 1058400,136080,0,20563200,37376640,20079360,
 3265920,0,372314880,726667200,453146400,106142400,
 7348320]