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A307990 as a simple table

na(n)
10
20
30
40
50
60
71
80
91
101
110
120
131
141
151
162
170
181
191
202
211
222
230
242
251
262
270
282
290
302
311
322
331
343
350
363
370
381
391
403
410
423
431
443
451
463
470
485
491
504
510
522
530
545
551
563
570
583
590
605
611
622
631
645
650
666
670
681
691
705
710
726
731
744
751
765
770
786
790
804
811
824
830
847
851
864

[0,0,0,0,0,0,1,0,1,1,0,0,1,1,1,2,0,1,1,2,1,2,0,2,
 1,2,0,2,0,2,1,2,1,3,0,3,0,1,1,3,0,3,1,3,1,3,0,5,1,
 4,0,2,0,5,1,3,0,3,0,5,1,2,1,5,0,6,0,1,1,5,0,6,1,4,
 1,5,0,6,0,4,1,4,0,7,1,4]