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A010839 as a simple table

na(n)
01
1-48
21080
3-15040
4143820
5-985824
64857920
7-16295040
828412910
938671600
10-424520544
111268350272
12-1211937160
13-4306546080
1418293091840
15-23522231424
16-26299018683
17137218594320
18-150999182320
19-134713340160

[1,-48,1080,-15040,143820,-985824,4857920,
 -16295040,28412910,38671600,-424520544,1268350272,
 -1211937160,-4306546080,18293091840,-23522231424,
 -26299018683,137218594320,-150999182320,
 -134713340160]