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A128637 as a simple table

na(n)
01
1-8
224
3-24
4-40
5144
6-120
7-192
8600
9-456
10-688
112016
12-1464
13-2096
145952
15-4176
16-5800
1715984
18-10920
19-14816
2039888
21-26688
22-35488
2393888
24-61752
25-80824
26210576
27-136536
28-176320
29453456
30-290448
31-370688
32942936
33-597600
34-755024
351901952
36-1194216

[1,-8,24,-24,-40,144,-120,-192,600,-456,-688,2016,
 -1464,-2096,5952,-4176,-5800,15984,-10920,-14816,
 39888,-26688,-35488,93888,-61752,-80824,210576,
 -136536,-176320,453456,-290448,-370688,942936,
 -597600,-755024,1901952,-1194216]