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A220805 as a simple table

na(n)
12
22
32
48
516
68
716
848
948
1016
1124
12256
13512
14256
1524
1664
17928
184096
194096
20928
2164
22128
234096
2430766
2562648
2630766
274096
28128
29232
3015820
31262144
321048576
331048576
34262144
3515820
36232
37512
3865536
392097152
4016777216
4133358976
4216777216
432097152
4465536

[2,2,2,8,16,8,16,48,48,16,24,256,512,256,24,64,
 928,4096,4096,928,64,128,4096,30766,62648,30766,
 4096,128,232,15820,262144,1048576,1048576,262144,
 15820,232,512,65536,2097152,16777216,33358976,
 16777216,2097152,65536]