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A013250 as a simple table

na(n)
01
10
20
30
4-3
540
6-250
7840
8-4515
987120
10-949500
114360400
12-24799775
131013539800
14-16719504750
1582697979000
16-246429558375
1740173677908000
18-928344422395000
193990578889492000
2032523853181113125

[1,0,0,0,-3,40,-250,840,-4515,87120,-949500,
 4360400,-24799775,1013539800,-16719504750,
 82697979000,-246429558375,40173677908000,
 -928344422395000,3990578889492000,
 32523853181113125]