The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 3 |
| 2 | 4 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 16 |
| 7 | 64 |
| 8 | 512 |
| 9 | 16384 |
| 10 | 2097152 |
| 11 | 2147483648 |
| 12 | 140737488355328 |
| 13 | 1180591620717411303424 |
| 14 | 40564819207303340847894502572032 |
| 15 | 365375409332725729550921208179070754913983135744 |
[4,3,4,2,4,8,16,64,512,16384,2097152,2147483648, 140737488355328,1180591620717411303424, 40564819207303340847894502572032, 365375409332725729550921208179070754913983135744] |