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A181633 as a simple table

na(n)
21
31
42
52
64
71
81
94
103
113
125
132
142
155
167
171
184
194
201
217
226
233
243
256
268
272
285
295
302
318
3210
331
347
354
364
377
381
3910
409
413
426
436
443
459
4611
472
488
495
505
518
522
5311
5413
551
5610
574
587
597
604
6110
621
6313
6412
653
669
676
686
699
703
7112
7214
732
7411
755
768
778
785
7911
802
8114
8216
831
8413
854
8610
877
887
8910
904
9113
921
9316
9415
953
9612
976
989
999
1006
10112
1023
10315

[1,1,2,2,4,1,1,4,3,3,5,2,2,5,7,1,4,4,1,7,6,3,3,6,
 8,2,5,5,2,8,10,1,7,4,4,7,1,10,9,3,6,6,3,9,11,2,8,
 5,5,8,2,11,13,1,10,4,7,7,4,10,1,13,12,3,9,6,6,9,3,
 12,14,2,11,5,8,8,5,11,2,14,16,1,13,4,10,7,7,10,4,
 13,1,16,15,3,12,6,9,9,6,12,3,15]