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A049381 as a simple table

na(n)
01
115
2300
36500
4146250
53363750
678487500
71850062500
843938984375
91049653515625
1025191684375000
11606890578125000
1214666522304687500
13355381117382812500
148630684279296875000
15210013317462890625000

[1,15,300,6500,146250,3363750,78487500,1850062500,
 43938984375,1049653515625,25191684375000,
 606890578125000,14666522304687500,
 355381117382812500,8630684279296875000,
 210013317462890625000]