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A007956 as a simple table

na(n)
11
21
31
42
51
66
71
88
93
1010
111
12144
131
1414
1515
1664
171
18324
191
20400
2121
2222
231
2413824
255
2626
2727
28784
291
3027000
311
321024
3333
3434
3535
36279936
371
3838
3939
4064000
411
4274088
431
441936
452025
4646
471
485308416
497
502500
5151
522704
531
54157464
5555
56175616
5757
5858
591
60777600000
611
6262
633969
6432768
6565

[1,1,1,2,1,6,1,8,3,10,1,144,1,14,15,64,1,324,1,
 400,21,22,1,13824,5,26,27,784,1,27000,1,1024,33,
 34,35,279936,1,38,39,64000,1,74088,1,1936,2025,46,
 1,5308416,7,2500,51,2704,1,157464,55,175616,57,58,
 1,777600000,1,62,3969,32768,65]