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A074799 as a simple table

na(n)
01
15
22187
340625
4892871875
520841167403
616443713753775
7421390226721321
8364130196991193221875
99816949116755633084375
108619392462988365485907909
11239904481399203205153660455

[1,5,2187,40625,892871875,20841167403,
 16443713753775,421390226721321,
 364130196991193221875,9816949116755633084375,
 8619392462988365485907909,
 239904481399203205153660455]