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A138219 as a simple table

na(n)
00
12
22
34
44
58
66
716
88
932
1010
1164
1212
13128
1414
15256
1616
17512
1818
191024
2020
212048
2222
234096
2424
258192
2626
2716384
2828
2932768
3030
3165536
3232
33131072
3434
35262144
3636
37524288
3838
391048576
4040
412097152
4242
434194304
4444
458388608
4646
4716777216
4848
4933554432
5050
5167108864
5252
53134217728

[0,2,2,4,4,8,6,16,8,32,10,64,12,128,14,256,16,512,
 18,1024,20,2048,22,4096,24,8192,26,16384,28,32768,
 30,65536,32,131072,34,262144,36,524288,38,1048576,
 40,2097152,42,4194304,44,8388608,46,16777216,48,
 33554432,50,67108864,52,134217728]