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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -3 |
| 3 | 22 |
| 4 | -251 |
| 5 | 3816 |
| 6 | -71207 |
| 7 | 1542640 |
| 8 | -36997431 |
| 9 | 929097856 |
| 10 | -22062115979 |
| 11 | 334968255744 |
| 12 | 13395424571725 |
| 13 | -2177817789105152 |
| 14 | 201597999475333329 |
| 15 | -16622491076645341184 |
| 16 | 1332634806870147259537 |
| 17 | -107073894723559010304000 |
[1,1,-3,22,-251,3816,-71207,1542640,-36997431, 929097856,-22062115979,334968255744, 13395424571725,-2177817789105152, 201597999475333329,-16622491076645341184, 1332634806870147259537,-107073894723559010304000] |