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A153494 as a simple table

na(n)
12
24
34
46
56
612
78
812
910
1012
1112
1224
1314
1416
1516
1618
1718
1824
1920
2024
2124
2224
2324
2448
2526
2628
2728
2830
2930
3036
3132
3236
3336
3436
3536
3648
3738
3840
3940
4048
4142
4248
4344
4448
4548
4648
4748
4860
4950
5054
5152
5254
5354
5460
5556
5660
5760
5860
5960
60120
6162
6264
6364
6466
6566
6672
6768
6872
6970
7072
7172

[2,4,4,6,6,12,8,12,10,12,12,24,14,16,16,18,18,24,
 20,24,24,24,24,48,26,28,28,30,30,36,32,36,36,36,
 36,48,38,40,40,48,42,48,44,48,48,48,48,60,50,54,
 52,54,54,60,56,60,60,60,60,120,62,64,64,66,66,72,
 68,72,70,72,72]