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A170923 as a simple table

na(n)
12
28
38
4128
532
6512
7128
832768
9128
1032768
112048
122097152
138192
142097152
1532768
162147483648
17131072
1816777216
19524288
2034359738368
212097152
228589934592
238388608
2435184372088832
25524288
26549755813888
2733554432
28562949953421312
29536870912
3035184372088832

[2,8,8,128,32,512,128,32768,128,32768,2048,
 2097152,8192,2097152,32768,2147483648,131072,
 16777216,524288,34359738368,2097152,8589934592,
 8388608,35184372088832,524288,549755813888,
 33554432,562949953421312,536870912,35184372088832]