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A201201 as a simple table

na(n)
01
1-4
21
318
4-10
51
6-96
786
8-18
91
10600
11-756
12246
13-28
141
15-4320
167092
17-3168
18552
19-40
201
2135280
22-71856
2341112
24-9720
251070
26-54
271
28-322560
29787824
30-552240
31165720
32-24600
331878
34-70
351
363265920
37-9329760
387768080
39-2835360
40531480
41-54516
423066
43-88

[1,-4,1,18,-10,1,-96,86,-18,1,600,-756,246,-28,1,
 -4320,7092,-3168,552,-40,1,35280,-71856,41112,
 -9720,1070,-54,1,-322560,787824,-552240,165720,
 -24600,1878,-70,1,3265920,-9329760,7768080,
 -2835360,531480,-54516,3066,-88]