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A068911 as a simple table

na(n)
01
12
24
36
412
518
636
754
8108
9162
10324
11486
12972
131458
142916
154374
168748
1713122
1826244
1939366
2078732
21118098
22236196
23354294
24708588
251062882
262125764
273188646
286377292
299565938
3019131876
3128697814
3257395628
3386093442
34172186884
35258280326
36516560652

[1,2,4,6,12,18,36,54,108,162,324,486,972,1458,
 2916,4374,8748,13122,26244,39366,78732,118098,
 236196,354294,708588,1062882,2125764,3188646,
 6377292,9565938,19131876,28697814,57395628,
 86093442,172186884,258280326,516560652]