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A056767 as a simple table

na(n)
12
24
38
416
532
664
7128
8256
9512
101024
112046
124095
138190
1416380
1532760
1665520
17131040
18262080
19524160
201048320
212097144
224193280
238386560
2416773900
2533547800
2667095600
27134191200
28268382400
29536215680
301073709000
312144142000
324288284000

[2,4,8,16,32,64,128,256,512,1024,2046,4095,8190,
 16380,32760,65520,131040,262080,524160,1048320,
 2097144,4193280,8386560,16773900,33547800,
 67095600,134191200,268382400,536215680,1073709000,
 2144142000,4288284000]