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A325664 as a simple table

na(n)
11
20
31
4-3
57
6-15
730
8-55
990
10-125
11125
120
13-450
141625
15-4250
169500
17-18999
1834357
19-55454
2075735
21-70890
22-26333
23379049
24-1352078
253713650
26-9000225
2720136806
28-42409968
2984819937
30-161567265
31292710630
32-501416815
33801992970
34-1167081365
351453179125

[1,0,1,-3,7,-15,30,-55,90,-125,125,0,-450,1625,
 -4250,9500,-18999,34357,-55454,75735,-70890,
 -26333,379049,-1352078,3713650,-9000225,20136806,
 -42409968,84819937,-161567265,292710630,
 -501416815,801992970,-1167081365,1453179125]