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A261867 as a simple table

na(n)
11
21
32
41
53
62
71
82
94
103
111
122
135
143
154
161
172
184
193
206
215
221
232
243
257
266
275
284
291
302
313
325
338
344
356
367
371
382
393
404
418
425
437
449
456
461
472
483
494
506
519
528
537
5410
555
561
572
583
594
606
617
625
6311
648
6510
669
671
682
693
704
715
728
7310
746
7512
769
7711
787
791
802
813
824
835
846
859
8612
877
8810
8913
9011
918
921
932
943
954
965
976
9810
999
10014
10113
1028
10311
10412
1057
1061
1072
1083
1094
1105
1116
1128
1139
11412
1157
11614
11710
11815
11913
12011

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