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A074139 as a simple table

na(n)
01
12
23
34
44
56
68
75
88
99
1012
1116
126
1310
1412
1516
1618
1724
1832
197
2012
2115
2216
2320
2424
2527
2632
2736
2848
2964
308
3114
3218
3320
3424
3530
3632
3736
3840
3948
4054
4164
4272
4396
44128
459
4616
4721
4824
4925
5028
5136
5240
5345
5448
5548
5660
5764
5872
5981
6080
6196
62108
63128
64144
65192
66256

[1,2,3,4,4,6,8,5,8,9,12,16,6,10,12,16,18,24,32,7,
 12,15,16,20,24,27,32,36,48,64,8,14,18,20,24,30,32,
 36,40,48,54,64,72,96,128,9,16,21,24,25,28,36,40,
 45,48,48,60,64,72,81,80,96,108,128,144,192,256]