| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 32 |
| 4 | 512 |
| 5 | 16384 |
| 6 | 1048576 |
| 7 | 134217728 |
| 8 | 34359738368 |
| 9 | 17592186044416 |
| 10 | 18014398509481984 |
| 11 | 36893488147419103232 |
| 12 | 151115727451828646838272 |
| 13 | 1237940039285380274899124224 |
| 14 | 20282409603651670423947251286016 |
| 15 | 664613997892457936451903530140172288 |
[1,4,32,512,16384,1048576,134217728,34359738368, 17592186044416,18014398509481984, 36893488147419103232,151115727451828646838272, 1237940039285380274899124224, 20282409603651670423947251286016, 664613997892457936451903530140172288] |