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A018131 as a simple table

na(n)
01
12
23
33
45
56
69
713
818
926
1036
1152
1274
13106
14151
15216
16310
17443
18633
19906
201296
211855
222654
233798
245435
257776
2611128
2715923
2822785
2932605
3046656
3166764
3295537
33136710
34195627
35279936
36400580
37573218
38820257

[1,2,3,3,5,6,9,13,18,26,36,52,74,106,151,216,310,
 443,633,906,1296,1855,2654,3798,5435,7776,11128,
 15923,22785,32605,46656,66764,95537,136710,195627,
 279936,400580,573218,820257]