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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | -2 |
| 4 | 8 |
| 5 | 88 |
| 6 | 592 |
| 7 | 3344 |
| 8 | 14464 |
| 9 | 2944 |
| 10 | -1121536 |
| 11 | -21603584 |
| 12 | -317969408 |
| 13 | -4202380288 |
| 14 | -51322677248 |
| 15 | -562045749248 |
| 16 | -4751724347392 |
| 17 | -3419742961664 |
| 18 | 1260396818661376 |
| 19 | 45221885372727296 |
| 20 | 1218206507254153216 |
| 21 | 29421299633821057024 |
| 22 | 669044215287581769728 |
| 23 | 14528992234596624498688 |
[1,-1,-2,-2,8,88,592,3344,14464,2944,-1121536, -21603584,-317969408,-4202380288,-51322677248, -562045749248,-4751724347392,-3419742961664, 1260396818661376,45221885372727296, 1218206507254153216,29421299633821057024, 669044215287581769728,14528992234596624498688] |