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A215748 as a simple table

na(n)
01
16
236
3216
41296
57776
646656
7279600
81668096
99840040
1056481396
11308389896
121530345504
136533946576
1423011191144

[1,6,36,216,1296,7776,46656,279600,1668096,
 9840040,56481396,308389896,1530345504,6533946576,
 23011191144]