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A024735 as a simple table

na(n)
12
21
31
42
54
68
718
840
988
10194
11460
121080
132514
145840
1514256
1634450
1782552
18197696
19489714
201204736
212945128
227188018
2318002376
2444805640
25110894770
26274209616
27691588200
281736001314
294338383356
3010827952192
3127470096770
3269388005832

[2,1,1,2,4,8,18,40,88,194,460,1080,2514,5840,
 14256,34450,82552,197696,489714,1204736,2945128,
 7188018,18002376,44805640,110894770,274209616,
 691588200,1736001314,4338383356,10827952192,
 27470096770,69388005832]