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A001615 as a simple table

na(n)
11
23
34
46
56
612
78
812
912
1018
1112
1224
1314
1424
1524
1624
1718
1836
1920
2036
2132
2236
2324
2448
2530
2642
2736
2848
2930
3072
3132
3248
3348
3454
3548
3672
3738
3860
3956
4072
4142
4296
4344
4472
4572
4672
4748
4896
4956
5090
5172
5284
5354
54108
5572
5696
5780
5890
5960
60144
6162
6296
6396
6496
6584
66144
6768
68108
6996

[1,3,4,6,6,12,8,12,12,18,12,24,14,24,24,24,18,36,
 20,36,32,36,24,48,30,42,36,48,30,72,32,48,48,54,
 48,72,38,60,56,72,42,96,44,72,72,72,48,96,56,90,
 72,84,54,108,72,96,80,90,60,144,62,96,96,96,84,
 144,68,108,96]