The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | 8 |
| 4 | 32 |
| 5 | -128 |
| 6 | -1024 |
| 7 | 16384 |
| 8 | 262144 |
| 9 | -4194304 |
| 10 | -134217728 |
| 11 | 8589934592 |
| 12 | 549755813888 |
| 13 | -35184372088832 |
| 14 | -4503599627370496 |
| 15 | 1152921504606846976 |
| 16 | 295147905179352825856 |
| 17 | -75557863725914323419136 |
| 18 | -38685626227668133590597632 |
| 19 | 39614081257132168796771975168 |
| 20 | 40564819207303340847894502572032 |
| 21 | -41538374868278621028243970633760768 |
| 22 | -85070591730234615865843651857942052864 |
| 23 | 348449143727040986586495598010130648530944 |
[1,-1,-2,8,32,-128,-1024,16384,262144,-4194304, -134217728,8589934592,549755813888, -35184372088832,-4503599627370496, 1152921504606846976,295147905179352825856, -75557863725914323419136, -38685626227668133590597632, 39614081257132168796771975168, 40564819207303340847894502572032, -41538374868278621028243970633760768, -85070591730234615865843651857942052864, 348449143727040986586495598010130648530944] |