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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 16 |
| 3 | 32 |
| 4 | 128 |
| 5 | 256 |
| 6 | 512 |
| 7 | 2048 |
| 8 | 8192 |
| 9 | 16384 |
| 10 | 32768 |
| 11 | 131072 |
| 12 | 262144 |
| 13 | 1048576 |
| 14 | 4194304 |
| 15 | 8388608 |
| 16 | 33554432 |
| 17 | 67108864 |
| 18 | 134217728 |
| 19 | 536870912 |
| 20 | 1073741824 |
| 21 | 4294967296 |
| 22 | 17179869184 |
| 23 | 34359738368 |
| 24 | 68719476736 |
| 25 | 274877906944 |
[1,4,16,32,128,256,512,2048,8192,16384,32768, 131072,262144,1048576,4194304,8388608,33554432, 67108864,134217728,536870912,1073741824, 4294967296,17179869184,34359738368,68719476736, 274877906944] |