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A090436 as a simple table

na(n)
11
25
3100
427500
5687500
67075062500
73594287401375000
881456034414253835114625000
935683959264371194185124824344091625000
10140789696830026154896057937831705061406034875000

[1,5,100,27500,687500,7075062500,3594287401375000,
 81456034414253835114625000,
 35683959264371194185124824344091625000,
 140789696830026154896057937831705061406034875000]