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A087470 as a simple table

na(n)
11
22
31
43
52
64
71
83
95
102
114
121
136
143
155
162
177
184
191
206
213
228
235
242
257
264
271
289
296
303
318
325
332
3410
357
364
371
389
396
403
4111
428
435
442
4510
467
474
481
4912
509
516
523
5311
548
555
562
5713
5810
597
604
611
6212
639
646
653
6614
6711
688
695
702
7113
7210
737
744
751
7615
7712
789
796
803
8114
8211
838
845
852
8616
8713
8810
897
904
911
9215
9312
949
956

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