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A067488 as a simple table

na(n)
11
216
3128
41024
516384
6131072
71048576
816777216
9134217728
101073741824
1117179869184
12137438953472
131099511627776
1417592186044416
15140737488355328
161125899906842624
1718014398509481984
18144115188075855872
191152921504606846976
2018446744073709551616

[1,16,128,1024,16384,131072,1048576,16777216,
 134217728,1073741824,17179869184,137438953472,
 1099511627776,17592186044416,140737488355328,
 1125899906842624,18014398509481984,
 144115188075855872,1152921504606846976,
 18446744073709551616]