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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 77 |
| 6 | 736 |
| 7 | 2077 |
| 8 | 22912 |
| 9 | 1197625 |
| 10 | 23597056 |
| 11 | 350173241 |
| 12 | 7161708544 |
| 13 | 236337969925 |
| 14 | 6751323455488 |
| 15 | 122041278706453 |
| 16 | 3799979465506816 |
| 17 | 298712815532930033 |
| 18 | 10872130692620222464 |
| 19 | -18153139467375673487 |
| 20 | -513247768690867306496 |
| 21 | 1172597577739561586096701 |
| 22 | 53608628175847428085252096 |
| 23 | -748272864671493582192607219 |
| 24 | -39715579516869644288006291456 |
| 25 | 7586072261976188853665242247977 |
[1,1,1,4,77,736,2077,22912,1197625,23597056, 350173241,7161708544,236337969925,6751323455488, 122041278706453,3799979465506816, 298712815532930033,10872130692620222464, -18153139467375673487,-513247768690867306496, 1172597577739561586096701, 53608628175847428085252096, -748272864671493582192607219, -39715579516869644288006291456, 7586072261976188853665242247977] |