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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -7 |
| 2 | -63 |
| 3 | -455 |
| 4 | -3199 |
| 5 | -22407 |
| 6 | -156863 |
| 7 | -1098055 |
| 8 | -7686399 |
| 9 | -53804807 |
| 10 | -376633663 |
| 11 | -2636435655 |
| 12 | -18455049599 |
| 13 | -129185347207 |
| 14 | -904297430463 |
| 15 | -6330082013255 |
| 16 | -44310574092799 |
| 17 | -310174018649607 |
| 18 | -2171218130547263 |
| 19 | -15198526913830855 |
| 20 | -106389688396815999 |
[1,-7,-63,-455,-3199,-22407,-156863,-1098055, -7686399,-53804807,-376633663,-2636435655, -18455049599,-129185347207,-904297430463, -6330082013255,-44310574092799,-310174018649607, -2171218130547263,-15198526913830855, -106389688396815999] |