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A066300 as a simple table

na(n)
10
21
327
41296
5100000
611390625
71801088541
8377801998336
9101559956668416
1034050628916015625
1113931233916552734375
126831675453247426400256
133955759092264800909058048
142670419511272061205254504361

[0,1,27,1296,100000,11390625,1801088541,
 377801998336,101559956668416,34050628916015625,
 13931233916552734375,6831675453247426400256,
 3955759092264800909058048,
 2670419511272061205254504361]