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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | -12 |
| 2 | 70 |
| 3 | 2856 |
| 4 | -164342 |
| 5 | -26727140 |
| 6 | 9513652174 |
| 7 | -1509132606128 |
| 8 | -24850989613038 |
| 9 | 96289752279508804 |
| 10 | -8229825010792301226 |
| 11 | -30295913573130207257992 |
| 12 | 26332910393982197524318746 |
[2,-12,70,2856,-164342,-26727140,9513652174, -1509132606128,-24850989613038,96289752279508804, -8229825010792301226,-30295913573130207257992, 26332910393982197524318746] |