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A078534 as a simple table

na(n)
01
15
2100
32625
478125
52502500
684150000
72929265625
8104646953125
93814697265625
10141323284375000
115305403695312500
12201382633183593750
137715985752343750000
14298023223876953125000
1511591412585295166015625
16453601640704152832031250

[1,5,100,2625,78125,2502500,84150000,2929265625,
 104646953125,3814697265625,141323284375000,
 5305403695312500,201382633183593750,
 7715985752343750000,298023223876953125000,
 11591412585295166015625,453601640704152832031250]