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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -866 |
| 3 | -10520 |
| 4 | 2249356 |
| 5 | 46111984 |
| 6 | -9735212024 |
| 7 | -282965467424 |
| 8 | 58973337166480 |
| 9 | 2232497686809664 |
| 10 | -459200359680279584 |
| 11 | -21527431036382354816 |
| 12 | 4369052165472543104704 |
| 13 | 245322538750961015791360 |
| 14 | -49114261974304335175370624 |
| 15 | -3225699756394083963693195776 |
[1,4,-866,-10520,2249356,46111984,-9735212024, -282965467424,58973337166480,2232497686809664, -459200359680279584,-21527431036382354816, 4369052165472543104704,245322538750961015791360, -49114261974304335175370624, -3225699756394083963693195776] |