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A273692 as a simple table

na(n)
02
18
22
332
432
5128
664
7512
8512
92048
10128
118192
128192
1332768
1416384
15131072
16131072
17524288
18131072
192097152
202097152
218388608
224194304
2333554432
2433554432
25134217728
2616777216
27536870912
28536870912
292147483648
301073741824
318589934592
328589934592
3334359738368

[2,8,2,32,32,128,64,512,512,2048,128,8192,8192,
 32768,16384,131072,131072,524288,131072,2097152,
 2097152,8388608,4194304,33554432,33554432,
 134217728,16777216,536870912,536870912,2147483648,
 1073741824,8589934592,8589934592,34359738368]