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A064661 as a simple table

na(n)
1-1
20
30
41
51
61
71
82
92
102
112
122
132
143
153
163
173
184
194
204
214
224
235
245
254
265
275
286
296
307
315
326
336
346
356
366
376
387
397
407
417
428
437
448
458
469
478
487
498
508
519
529
5310
549
559
569
579
5810
5910
6011
6111
6211
6310
6410
6511
6611
6710
6811
6910
7011
7111
7211
7311
7412
7512
7612
7712
7812
7913
8012
8112

[-1,0,0,1,1,1,1,2,2,2,2,2,2,3,3,3,3,4,4,4,4,4,5,5,
 4,5,5,6,6,7,5,6,6,6,6,6,6,7,7,7,7,8,7,8,8,9,8,7,8,
 8,9,9,10,9,9,9,9,10,10,11,11,11,10,10,11,11,10,11,
 10,11,11,11,11,12,12,12,12,12,13,12,12]