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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | -22 |
| 2 | -263 |
| 3 | -2284 |
| 4 | -16225 |
| 5 | -100490 |
| 6 | -564096 |
| 7 | -2943434 |
| 8 | -14525316 |
| 9 | -68623698 |
| 10 | -313160381 |
| 11 | -1389603972 |
| 12 | -6026265844 |
| 13 | -25641735564 |
| 14 | -107383041717 |
| 15 | -443700335414 |
| 16 | -1812509085585 |
| 17 | -7331932395596 |
| 18 | -29409752732192 |
| 19 | -117108140185676 |
| 20 | -463355891177610 |
| 21 | -1823137506023896 |
[-1,-22,-263,-2284,-16225,-100490,-564096, -2943434,-14525316,-68623698,-313160381, -1389603972,-6026265844,-25641735564, -107383041717,-443700335414,-1812509085585, -7331932395596,-29409752732192,-117108140185676, -463355891177610,-1823137506023896] |