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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -542 |
| 3 | -10188 |
| 4 | 878700 |
| 5 | 28826856 |
| 6 | -2366481864 |
| 7 | -114170427792 |
| 8 | 8889763054992 |
| 9 | 581262636440160 |
| 10 | -42756971593427424 |
| 11 | -3616239868184689344 |
| 12 | 250151386181903425728 |
| 13 | 26583148042820425844352 |
| 14 | -1720138627513899785854080 |
| 15 | -225431665727586284647620864 |
[1,6,-542,-10188,878700,28826856,-2366481864, -114170427792,8889763054992,581262636440160, -42756971593427424,-3616239868184689344, 250151386181903425728,26583148042820425844352, -1720138627513899785854080, -225431665727586284647620864] |