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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 9 |
| 4 | -65 |
| 5 | 653 |
| 6 | -8432 |
| 7 | 133190 |
| 8 | -2488589 |
| 9 | 53690330 |
| 10 | -1313508417 |
| 11 | 35929413073 |
| 12 | -1086587503799 |
| 13 | 35998774583176 |
| 14 | -1296581783771904 |
| 15 | 50442455219483951 |
| 16 | -2108020240791081088 |
| 17 | 94179374365406507609 |
| 18 | -4479409651990684350045 |
| 19 | 225977974437623955594777 |
[1,-2,9,-65,653,-8432,133190,-2488589,53690330, -1313508417,35929413073,-1086587503799, 35998774583176,-1296581783771904, 50442455219483951,-2108020240791081088, 94179374365406507609,-4479409651990684350045, 225977974437623955594777] |