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A031310 as a simple table

na(n)
18
27
36
45
54
63
72
81
90
108
119
128
138
148
157
168
176
188
195
208
214
228
233
248
252
268
271
288
290
307
319
327
338
347
357
367
376
387
395
407
414
427
433
447
452
467
471
487
490
506
519
526
538
546
557
566
576
586
595
606
614
626
633
646
652
666
671
686
690
705
719
725
738
745
757
765
776
785
795
805
814
825
833
845
852
865
871
885
890
904

[8,7,6,5,4,3,2,1,0,8,9,8,8,8,7,8,6,8,5,8,4,8,3,8,
 2,8,1,8,0,7,9,7,8,7,7,7,6,7,5,7,4,7,3,7,2,7,1,7,0,
 6,9,6,8,6,7,6,6,6,5,6,4,6,3,6,2,6,1,6,0,5,9,5,8,5,
 7,5,6,5,5,5,4,5,3,5,2,5,1,5,0,4]