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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | -2088 |
| 3 | 301296 |
| 4 | -50784174 |
| 5 | 9174627360 |
| 6 | -1734603719472 |
| 7 | 338286925650240 |
| 8 | -67486440186470016 |
| 9 | 13697820033167444178 |
| 10 | -2818359890320927630320 |
| 11 | 586296297186462310481424 |
| 12 | -123077156275866375661524864 |
| 13 | 26034142700316716015964656544 |
[1,18,-2088,301296,-50784174,9174627360, -1734603719472,338286925650240,-67486440186470016, 13697820033167444178,-2818359890320927630320, 586296297186462310481424, -123077156275866375661524864, 26034142700316716015964656544] |