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A338549 as a simple table

na(n)
11
2-17
380
4-240
5624
6-1360
72400
8-3840
96480
10-10608
1114640
12-19200
1328560
14-40800
1549920
16-61440
1783520
18-110160
19130320
20-149760
21192000
22-248880
23279840
24-307200
25390000
26-485520
27524880
28-576000
29707280
30-848640
31923520
32-983040
331171200
34-1419840
351497600
36-1555200

[1,-17,80,-240,624,-1360,2400,-3840,6480,-10608,
 14640,-19200,28560,-40800,49920,-61440,83520,
 -110160,130320,-149760,192000,-248880,279840,
 -307200,390000,-485520,524880,-576000,707280,
 -848640,923520,-983040,1171200,-1419840,1497600,
 -1555200]