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A174478 as a simple table

na(n)
12
212
320
456
552
6168
7156
8432
9614
101272
112092
124784
138244
1417064
1533160
1667040
17131140
18265092
19524364
201053616
212098200
224202760
238388700
2416797216
2533554902
2667141944
27134221232
28268503312
29536871028
301073881488
312147483772

[2,12,20,56,52,168,156,432,614,1272,2092,4784,
 8244,17064,33160,67040,131140,265092,524364,
 1053616,2098200,4202760,8388700,16797216,33554902,
 67141944,134221232,268503312,536871028,1073881488,
 2147483772]