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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 248 |
| 3 | 3968 |
| 4 | 63488 |
| 5 | 1048320 |
| 6 | 16777216 |
| 7 | 268435072 |
| 8 | 4294961152 |
| 9 | 68702699520 |
| 10 | 1099511597056 |
| 11 | 17592186044416 |
| 12 | 281474976700416 |
| 13 | 4503599627206656 |
| 14 | 72057490958712832 |
| 15 | 1152921504603963392 |
| 16 | 18446744073709551616 |
[16,248,3968,63488,1048320,16777216,268435072, 4294961152,68702699520,1099511597056, 17592186044416,281474976700416,4503599627206656, 72057490958712832,1152921504603963392, 18446744073709551616] |