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A274615 as a simple table

na(n)
01
14
25
32
40
58
63
76
87
912
1013
1110
1211
139
1417
1514
1615
1720
1821
1918
2016
2124
2219
2322
2423
2528
2629
2726
2827
2925
3033
3130
3231
3336
3437
3534
3632
3740
3835
3938
4039
4144
4245
4342
4443
4541
4649
4746
4847
4952
5053
5150
5248
5356
5451
5554
5655
5760
5861
5958
6059
6157
6265
6362
6463
6568
6669
6766

[1,4,5,2,0,8,3,6,7,12,13,10,11,9,17,14,15,20,21,
 18,16,24,19,22,23,28,29,26,27,25,33,30,31,36,37,
 34,32,40,35,38,39,44,45,42,43,41,49,46,47,52,53,
 50,48,56,51,54,55,60,61,58,59,57,65,62,63,68,69,
 66]