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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 32 |
| 3 | 256 |
| 4 | 2048 |
| 5 | 16384 |
| 6 | 131072 |
| 7 | 1048576 |
| 8 | 8388608 |
| 9 | 67108864 |
| 10 | 536870912 |
| 11 | 4294967296 |
| 12 | 34359738368 |
| 13 | 274877906944 |
| 14 | 2199023255552 |
| 15 | 17592186044416 |
| 16 | 140737488355328 |
| 17 | 1125899906842624 |
| 18 | 9007199254740992 |
| 19 | 72057594037927936 |
| 20 | 576460752303423488 |
| 21 | 4611686018427387904 |
[1,4,32,256,2048,16384,131072,1048576,8388608, 67108864,536870912,4294967296,34359738368, 274877906944,2199023255552,17592186044416, 140737488355328,1125899906842624,9007199254740992, 72057594037927936,576460752303423488, 4611686018427387904] |