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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -4071 |
| 3 | -531316 |
| 4 | -16776591 |
| 5 | -244137500 |
| 6 | -2176766711 |
| 7 | -13841209076 |
| 8 | -68719086111 |
| 9 | -282427583356 |
| 10 | -999990234375 |
| 11 | -3138379548596 |
| 12 | -8915856307631 |
| 13 | -23296864419356 |
| 14 | -56687808859671 |
| 15 | -129715820312500 |
| 16 | -281322388820031 |
[1,4,-4071,-531316,-16776591,-244137500, -2176766711,-13841209076,-68719086111, -282427583356,-999990234375,-3138379548596, -8915856307631,-23296864419356,-56687808859671, -129715820312500,-281322388820031] |