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A010830 as a simple table

na(n)
01
1-25
2275
3-1700
46050
5-9405
6-15550
7107525
8-182875
9-81675
10756655
11-801550
12-662975
131220175
141361350
15-209440
16-9601900
178608900
1814889050
19-19948500
20-6262465
21-7057550
2238788925
2319716425
24-69119875
2523579969
26-82427400
2798068850
28191984400

[1,-25,275,-1700,6050,-9405,-15550,107525,-182875,
 -81675,756655,-801550,-662975,1220175,1361350,
 -209440,-9601900,8608900,14889050,-19948500,
 -6262465,-7057550,38788925,19716425,-69119875,
 23579969,-82427400,98068850,191984400]