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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | -14 |
| 4 | 1777 |
| 5 | -14744 |
| 6 | 247994 |
| 7 | -74928944 |
| 8 | 42293543177 |
| 9 | -1163849271296 |
| 10 | 95795966018440 |
| 11 | -44942000161435904 |
| 12 | 4494117864138588514 |
| 13 | -3539995034294896016384 |
| 14 | 770158600620174924566672 |
| 15 | -510461123036204706738612224 |
| 16 | 1162153458061287151457003978297 |
[1,5,-14,1777,-14744,247994,-74928944,42293543177, -1163849271296,95795966018440,-44942000161435904, 4494117864138588514,-3539995034294896016384, 770158600620174924566672, -510461123036204706738612224, 1162153458061287151457003978297] |