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A156232 as a simple table

na(n)
20
34
44
516
624
764
8112
9256
10480
111024
121984
134096
148064
1516384
1632512
1765536
18130560
19262144
20523264
211048576
222095104
234194304
248384512
2516777216
2633546240
2767108864
28134201344
29268435456
30536838144
311073741824
322147418112

[0,4,4,16,24,64,112,256,480,1024,1984,4096,8064,
 16384,32512,65536,130560,262144,523264,1048576,
 2095104,4194304,8384512,16777216,33546240,
 67108864,134201344,268435456,536838144,1073741824,
 2147418112]