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A253686 as a simple table

na(n)
16
21
33
41
56
63
73
84
93
105
113
122
136
146
156
166
173
185
196
206
216
226
236
243
256
266
274
286
296
306
316
326
336
346
356
366
376
386
396
404
416
426
436
446
456
466
476
486
496
506
516
526
533
546
556
564
576
586
596
606
616
625
636
646
656
666
676
686
696
706
714
726
736
746
756
766
776
786
796
806
816
826
836
846
856
866
876
886

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