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A181803 as a simple table

na(n)
11
21
32
43
51
62
74
85
91
103
116
127
132
144
158
169
175
1810
1911
201
212
223
236
2412
2513
267
2714
2815
294
308
3116
3217
333
349
3518
3619
375
3810
3920
4021
4111
4222
4323
441
452
464
476
4812
4924
5025
5113
5226
5327
547
5514
5628
5729
585
5915
6030
6131
628
6316
6432
6533
6617
6734
6835
691
703
716
729
7318
7436
7537
7619
7738
7839
7910
8020
8140
8241
837
8421
8542

[1,1,2,3,1,2,4,5,1,3,6,7,2,4,8,9,5,10,11,1,2,3,6,
 12,13,7,14,15,4,8,16,17,3,9,18,19,5,10,20,21,11,
 22,23,1,2,4,6,12,24,25,13,26,27,7,14,28,29,5,15,
 30,31,8,16,32,33,17,34,35,1,3,6,9,18,36,37,19,38,
 39,10,20,40,41,7,21,42]