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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | 11 |
| 4 | -47 |
| 5 | 601 |
| 6 | -5521 |
| 7 | 86771 |
| 8 | -1296287 |
| 9 | 25482481 |
| 10 | -527699041 |
| 11 | 12800059931 |
| 12 | -335639304527 |
| 13 | 9794548687561 |
| 14 | -308817517422961 |
| 15 | 10573293809103491 |
| 16 | -388317397661640767 |
| 17 | 15275057087004591841 |
| 18 | -639584224876056953281 |
| 19 | 28426125263460829489451 |
| 20 | -1335823888802587475761007 |
[1,1,-1,11,-47,601,-5521,86771,-1296287,25482481, -527699041,12800059931,-335639304527, 9794548687561,-308817517422961,10573293809103491, -388317397661640767,15275057087004591841, -639584224876056953281,28426125263460829489451, -1335823888802587475761007] |