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A307908 as a simple table

na(n)
21
31
42
51
63
71
83
92
104
111
124
131
144
153
164
171
185
191
205
213
225
231
245
252
265
273
285
291
305
311
325
334
346
353
366
371
386
394
406
411
426
431
446
454
466
471
486
492
506
514
526
531
546
553
566
574
586
591
606
611
626
634
646
653
667
671
687
694
707
711
727
731
747
754
767
773
787
791
807
814
827
831
847
853
867
875
887

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