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A133421 as a simple table

na(n)
18
21
31
42
51
63
750
84
93
105
1178
126
1392
147
155
168
17120
189
19134
2010
217
2211
23162
2412
255
2613
279
2814
29204
3015
31218
3216
3311
3417
357
3618
37260
3819
3913
4020
41288
4221
43302
4422
4515
4623
47330
4824
49344
5025
5117
5226
53372
5427
5511
5628
5719
5829
59414
6030
61428
6231
6321
6432
6513
6633
67470
6834
6923
7035
71498

[8,1,1,2,1,3,50,4,3,5,78,6,92,7,5,8,120,9,134,10,
 7,11,162,12,5,13,9,14,204,15,218,16,11,17,7,18,
 260,19,13,20,288,21,302,22,15,23,330,24,344,25,17,
 26,372,27,11,28,19,29,414,30,428,31,21,32,13,33,
 470,34,23,35,498]