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A087186 as a simple table

na(n)
12
24
331
4304
540044
6500522
786094668
81167752848
9225001039696
10652498288154820
119451735761626880
1229731605314969017772
136529673496702876605072
1497300805803445759460364

[2,4,31,304,40044,500522,86094668,1167752848,
 225001039696,652498288154820,9451735761626880,
 29731605314969017772,6529673496702876605072,
 97300805803445759460364]