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A013616 as a simple table

na(n)
01
11
29
31
418
581
61
727
8243
9729
101
1136
12486
132916
146561
151
1645
17810
187290
1932805
2059049
211
2254
231215
2414580
2598415
26354294
27531441
281
2963
301701
3125515
32229635
331240029
343720087
354782969
361
3772
382268
3940824
40459270
413306744
4214880348
4338263752
4443046721

[1,1,9,1,18,81,1,27,243,729,1,36,486,2916,6561,1,
 45,810,7290,32805,59049,1,54,1215,14580,98415,
 354294,531441,1,63,1701,25515,229635,1240029,
 3720087,4782969,1,72,2268,40824,459270,3306744,
 14880348,38263752,43046721]