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A175816 as a simple table

na(n)
1-1
20
3-1
40
51
60
7-1
8-2
9-1
100
11-1
120
13-1
140
15-1
160
171
182
193
204
215
226
235
246
257
268
277
288
297
308
317
328
337
348
357
366
375
384
395
406
415
426
435
444
453
462
473
484
493
502
513
524
535
546
557
566
575
584
595
606
617
628
639
6410
659
6610
679
6810
6911
7012
7113
7214
7315
7416
7515
7616
7715
7816
7917
8018
8119
8218
8317
8418
8517
8618
8719
8818
8919

[-1,0,-1,0,1,0,-1,-2,-1,0,-1,0,-1,0,-1,0,1,2,3,4,
 5,6,5,6,7,8,7,8,7,8,7,8,7,8,7,6,5,4,5,6,5,6,5,4,3,
 2,3,4,3,2,3,4,5,6,7,6,5,4,5,6,7,8,9,10,9,10,9,10,
 11,12,13,14,15,16,15,16,15,16,17,18,19,18,17,18,
 17,18,19,18,19]