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A222938 as a simple table

na(n)
116
2232
34096
463488
51047664
616776992
7268435456
84294967296
968702202624
101099511627776
1117592186044416
12281474975006720
134503599620030464
1472057490958712832
151152921504606846976
1618446744073700638720

[16,232,4096,63488,1047664,16776992,268435456,
 4294967296,68702202624,1099511627776,
 17592186044416,281474975006720,4503599620030464,
 72057490958712832,1152921504606846976,
 18446744073700638720]