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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -22 |
| 2 | 198 |
| 3 | -924 |
| 4 | 2310 |
| 5 | -2772 |
| 6 | 924 |
| 7 | 264 |
| 8 | 198 |
| 9 | 220 |
| 10 | 308 |
| 11 | 504 |
| 12 | 924 |
| 13 | 1848 |
| 14 | 3960 |
| 15 | 8976 |
| 16 | 21318 |
| 17 | 52668 |
| 18 | 134596 |
| 19 | 354200 |
| 20 | 956340 |
| 21 | 2641320 |
| 22 | 7443720 |
| 23 | 21360240 |
| 24 | 62300700 |
| 25 | 184410072 |
| 26 | 553230216 |
| 27 | 1680180656 |
| 28 | 5160554872 |
| 29 | 16015515120 |
| 30 | 50181947376 |
| 31 | 158639704608 |
| 32 | 505664058438 |
[1,-22,198,-924,2310,-2772,924,264,198,220,308, 504,924,1848,3960,8976,21318,52668,134596,354200, 956340,2641320,7443720,21360240,62300700, 184410072,553230216,1680180656,5160554872, 16015515120,50181947376,158639704608,505664058438] |