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A068578 as a simple table

na(n)
12
23
34
46
58
610
712
814
916
1018
1120
1224
1330
1436
1540
1642
1748
1860
1972
2084
2190
22120
23180

[2,3,4,6,8,10,12,14,16,18,20,24,30,36,40,42,48,60,
 72,84,90,120,180]