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A281975 as a simple table

na(n)
01
13
24
33
42
54
64
72
81
94
105
113
121
132
143
152
163
175
187
193
204
215
222
231
242
256
269
276
282
294
306
313
324
336
348
354
366
375
384
393
402
4111
4210
434
441
457
465
471
483
493
5011
519
527
535
546
554
562
577
585
594
602
616
624
633
642
657
6615
674
684
696
705
711
722
736
747
757
763
776
784
792
804

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