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A200031 as a simple table

na(n)
01
15
225
3150
41000
57125
653125
7409375
83234375
926059375
10213296875
111768625000
1214825156250
13125419296875
141069473046875
159182583593750
1679319843750000
17688837802734375
186010580419921875
1952670308222656250
20463321803125000000
214089876834521484375
2236217014743896484375

[1,5,25,150,1000,7125,53125,409375,3234375,
 26059375,213296875,1768625000,14825156250,
 125419296875,1069473046875,9182583593750,
 79319843750000,688837802734375,6010580419921875,
 52670308222656250,463321803125000000,
 4089876834521484375,36217014743896484375]