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A178151 as a simple table

na(n)
21
31
42
54
63
74
86
97
107
119
129
1310
1412
1514
1613
1719
1815
1918
2021
2118
2222
2325
2422
2524
2625
2728
2831
2927
3028
3134
3240
3334
3439
3537
3641
3739
3842
3947
4043
4152
4245
4354
4448
4549
4654
4757
4859
4964
5057
5158
5267
5360
5473
5564
5672
5767
5873
5969
6070
6175
6273
6381
6487
6578
6679
6787
6884
6994
7087
7188
7299
7396
7493

[1,1,2,4,3,4,6,7,7,9,9,10,12,14,13,19,15,18,21,18,
 22,25,22,24,25,28,31,27,28,34,40,34,39,37,41,39,
 42,47,43,52,45,54,48,49,54,57,59,64,57,58,67,60,
 73,64,72,67,73,69,70,75,73,81,87,78,79,87,84,94,
 87,88,99,96,93]