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A181975 as a simple table

na(n)
11
22
33
44
55
64
73
82
91
102
113
124
135
144
153
162
171
182
193
204
215
224
233
242
251
262
273
284
295
304
313
322
331
342
353
364
375
384
393
402
411
422
433
444
455
464
473
482
491
502
513
524
535
544
553
562
571
582
593
604
615
624
633
642
651
662
673
684
695
704
713
722
731
742
753
764
775
784
793
802
811
822
833
844
855
864
873

[1,2,3,4,5,4,3,2,1,2,3,4,5,4,3,2,1,2,3,4,5,4,3,2,
 1,2,3,4,5,4,3,2,1,2,3,4,5,4,3,2,1,2,3,4,5,4,3,2,1,
 2,3,4,5,4,3,2,1,2,3,4,5,4,3,2,1,2,3,4,5,4,3,2,1,2,
 3,4,5,4,3,2,1,2,3,4,5,4,3]