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A064881 as a simple table

na(n)
11
22
31
43
52
61
74
83
95
102
111
125
134
147
153
168
175
187
192
201
216
225
239
244
2511
267
2710
283
2911
308
3113
325
3312
347
359
362
371
387
396
4011
415
4214
439
4413
454
4615
4711
4818
497
5017
5110
5213
533
5414
5511
5619
578
5821
5913
6018
615
6217
6312
6419
657
6616
679
6811
692

[1,2,1,3,2,1,4,3,5,2,1,5,4,7,3,8,5,7,2,1,6,5,9,4,
 11,7,10,3,11,8,13,5,12,7,9,2,1,7,6,11,5,14,9,13,4,
 15,11,18,7,17,10,13,3,14,11,19,8,21,13,18,5,17,12,
 19,7,16,9,11,2]