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A010833 as a simple table

na(n)
01
1-28
2350
3-2520
411025
5-26180
64158
7184600
8-554400
9401100
101496964
11-3920280
121444625
136224400
14-4972350
15-7121296
16-8308965
1750796900
18-8971200
19-121968000
2094011435
2180598288
2220282500
23-175228200

[1,-28,350,-2520,11025,-26180,4158,184600,-554400,
 401100,1496964,-3920280,1444625,6224400,-4972350,
 -7121296,-8308965,50796900,-8971200,-121968000,
 94011435,80598288,20282500,-175228200]