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A002251 as a simple table

na(n)
00
12
21
35
47
53
610
74
813
915
106
1118
1220
138
1423
159
1626
1728
1811
1931
2012
2134
2236
2314
2439
2541
2616
2744
2817
2947
3049
3119
3252
3354
3421
3557
3622
3760
3862
3924
4065
4125
4268
4370
4427
4573
4675
4729
4878
4930
5081
5183
5232
5386
5433
5589
5691
5735
5894
5996
6037
6199
6238
63102
64104
6540
66107
67109

[0,2,1,5,7,3,10,4,13,15,6,18,20,8,23,9,26,28,11,
 31,12,34,36,14,39,41,16,44,17,47,49,19,52,54,21,
 57,22,60,62,24,65,25,68,70,27,73,75,29,78,30,81,
 83,32,86,33,89,91,35,94,96,37,99,38,102,104,40,
 107,109]