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A189925 as a simple table

na(n)
01
1-4
28
3-16
432
5-56
696
7-160
8256
9-404
10624
11-944
121408
13-2072
143008
15-4320
166144
17-8648
1812072
19-16720
2022976
21-31360
2242528
23-57312
2476800
25-102364
26135728
27-179104
28235264
29-307672
30400704
31-519808
32671744
33-864960
341109904

[1,-4,8,-16,32,-56,96,-160,256,-404,624,-944,1408,
 -2072,3008,-4320,6144,-8648,12072,-16720,22976,
 -31360,42528,-57312,76800,-102364,135728,-179104,
 235264,-307672,400704,-519808,671744,-864960,
 1109904]