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A124395 as a simple table

na(n)
01
10
20
3-2
4-4
5-8
6-12
7-16
8-16
9-8
1016
1164
12144
13256
14384
15480
16448
17128
18-704
19-2304
20-4864
21-8320
22-12032
23-14336
24-12032
250
2628672
2781408
28162816
29268288
30373760
31421888
32307200
33-133120
34-1110016
35-2834432
36-5402624
37-8585216
38-11501568
39-12197888

[1,0,0,-2,-4,-8,-12,-16,-16,-8,16,64,144,256,384,
 480,448,128,-704,-2304,-4864,-8320,-12032,-14336,
 -12032,0,28672,81408,162816,268288,373760,421888,
 307200,-133120,-1110016,-2834432,-5402624,
 -8585216,-11501568,-12197888]