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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | -6 |
| 3 | 28 |
| 4 | -410 |
| 5 | -40548 |
| 6 | -25678044 |
| 7 | -46695237064 |
| 8 | -261442466307066 |
| 9 | -4697327493273424596 |
| 10 | -282093987534237286507572 |
| 11 | -58573002543105566470447978872 |
| 12 | -43150254003464729476289222051517988 |
| 13 | -114953354885565948577897809039842112360424 |
[1,2,-6,28,-410,-40548,-25678044,-46695237064, -261442466307066,-4697327493273424596, -282093987534237286507572, -58573002543105566470447978872, -43150254003464729476289222051517988, -114953354885565948577897809039842112360424] |