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A260481 as a simple table

na(n)
01
15
2725
3494613125
4237200374061503726953125
557083011552674242150083383668890855252740781729278564453125

[1,5,725,494613125,237200374061503726953125,
 57083011552674242150083383668890855252740781729278\
 564453125]