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A001760 as a simple table

na(n)
12
260
3836
49576
5103326
61106820
712062152
8135391872
91575253690
1019058801580
11240134763948
123152151344088
1343098592576694
14613444153400340
159082400109162224
16139747529003597424
172232451845925297938

[2,60,836,9576,103326,1106820,12062152,135391872,
 1575253690,19058801580,240134763948,3152151344088,
 43098592576694,613444153400340,9082400109162224,
 139747529003597424,2232451845925297938]