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A289388 as a simple table

na(n)
00
10
20
31
44
510
620
735
855
975
1075
110
12-275
13-1000
14-2625
15-5875
16-11750
17-21250
18-34375
19-47500
20-47500
210
22171875
23621875
241628125
253640625
267281250
2713171875
2821312500
2929453125
3029453125
310
32-106562500
33-385546875
34-1009375000
35-2257031250
36-4514062500

[0,0,0,1,4,10,20,35,55,75,75,0,-275,-1000,-2625,
 -5875,-11750,-21250,-34375,-47500,-47500,0,171875,
 621875,1628125,3640625,7281250,13171875,21312500,
 29453125,29453125,0,-106562500,-385546875,
 -1009375000,-2257031250,-4514062500]