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A281409 as a simple table

na(n)
15
21
32
43
54
67
79
88
910
106
1114
1216
1312
1420
1528
1624
1713
1811
1915
2018
2121
2233
2327
2430
2519
2641
2722
2825
2947
3036
3158
3250
3342
3423
3561
3631
3732
3863
3965
4064
4143
4285
4344
4491
4545
4617
4740
4857
4974
5097
5151
5237
5360
5483
55106
56129
57152
58175
59109
6066
6135
6239
6382
64113
65133
6693

[5,1,2,3,4,7,9,8,10,6,14,16,12,20,28,24,13,11,15,
 18,21,33,27,30,19,41,22,25,47,36,58,50,42,23,61,
 31,32,63,65,64,43,85,44,91,45,17,40,57,74,97,51,
 37,60,83,106,129,152,175,109,66,35,39,82,113,133,
 93]