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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 10 |
| 4 | -47 |
| 5 | 303 |
| 6 | -2389 |
| 7 | 22622 |
| 8 | -249724 |
| 9 | 3150109 |
| 10 | -44706126 |
| 11 | 705095994 |
| 12 | -12235794207 |
| 13 | 231698450475 |
| 14 | -4754358750933 |
| 15 | 105087911110062 |
| 16 | -2489277413102144 |
| 17 | 62908278710542137 |
| 18 | -1689451592993832258 |
| 19 | 48047639078438987082 |
| 20 | -1442565756163540276727 |
[0,1,-2,10,-47,303,-2389,22622,-249724,3150109, -44706126,705095994,-12235794207,231698450475, -4754358750933,105087911110062,-2489277413102144, 62908278710542137,-1689451592993832258, 48047639078438987082,-1442565756163540276727] |