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A067494 as a simple table

na(n)
11
216777216
3134217728
41073741824
518014398509481984
6144115188075855872
71152921504606846976
819342813113834066795298816
9154742504910672534362390528
101237940039285380274899124224

[1,16777216,134217728,1073741824,
 18014398509481984,144115188075855872,
 1152921504606846976,19342813113834066795298816,
 154742504910672534362390528,
 1237940039285380274899124224]