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A070323 as a simple table

na(n)
12
22
34
48
532
664
7256
8512
92048
1012288
1124576
12147456
13589824
141179648
154718592
1628311552
17169869312
18339738624
192038431744
208153726976
2116307453952
2297844723712
23391378894848
242348273369088
2518786186952704
2675144747810816

[2,2,4,8,32,64,256,512,2048,12288,24576,147456,
 589824,1179648,4718592,28311552,169869312,
 339738624,2038431744,8153726976,16307453952,
 97844723712,391378894848,2348273369088,
 18786186952704,75144747810816]