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A289389 as a simple table

na(n)
00
10
20
30
41
55
615
735
870
9125
10200
11275
12275
130
14-1000
15-3625
16-9500
17-21250
18-42500
19-76875
20-124375
21-171875
22-171875
230
24621875
252250000
265890625
2713171875
2826343750
2947656250
3077109375
31106562500
32106562500
330
34-385546875
35-1394921875
36-3651953125

[0,0,0,0,1,5,15,35,70,125,200,275,275,0,-1000,
 -3625,-9500,-21250,-42500,-76875,-124375,-171875,
 -171875,0,621875,2250000,5890625,13171875,
 26343750,47656250,77109375,106562500,106562500,0,
 -385546875,-1394921875,-3651953125]