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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 6 |
| 5 | 55 |
| 6 | 826 |
| 7 | 20839 |
| 8 | 925470 |
| 9 | 76332845 |
| 10 | 12144225666 |
| 11 | 3786386476697 |
| 12 | 2323365229270526 |
| 13 | 2810644438909846175 |
| 14 | 6714880936575265290018 |
| 15 | 31734660733696955320333111 |
| 16 | 297106568811291486526250342118 |
| 17 | 5516820501917771489801597101682245 |
[1,0,0,1,6,55,826,20839,925470,76332845, 12144225666,3786386476697,2323365229270526, 2810644438909846175,6714880936575265290018, 31734660733696955320333111, 297106568811291486526250342118, 5516820501917771489801597101682245] |