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A220172 as a simple table

na(n)
12
22
38
416
524
664
7128
8232
9512
101024
111984
124096
138192
1416224
1532768
1665536
17130688
18262144
19524288
201047680
212097152
224194304
238386560
2416777216
2533554432
2667104256
27134217728
28268435456
29536860672
301073741824
312147483648
324294944768

[2,2,8,16,24,64,128,232,512,1024,1984,4096,8192,
 16224,32768,65536,130688,262144,524288,1047680,
 2097152,4194304,8386560,16777216,33554432,
 67104256,134217728,268435456,536860672,1073741824,
 2147483648,4294944768]