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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 5 |
| 3 | 3 |
| 4 | 119 |
| 5 | 207 |
| 6 | 1311 |
| 7 | 191 |
| 8 | 31871 |
| 9 | 62207 |
| 10 | 377343 |
| 11 | 211967 |
| 12 | 7628799 |
| 13 | 12750847 |
| 14 | 87056383 |
| 15 | 5128191 |
| 16 | 2115600383 |
| 17 | 4188078079 |
| 18 | 25268453375 |
| 19 | 15329394687 |
| 20 | 506978631679 |
| 21 | 866512797695 |
| 22 | 5511502102527 |
| 23 | 1050064977919 |
| 24 | 138276212047871 |
| 25 | 267395251830783 |
[1,0,5,3,119,207,1311,191,31871,62207,377343, 211967,7628799,12750847,87056383,5128191, 2115600383,4188078079,25268453375,15329394687, 506978631679,866512797695,5511502102527, 1050064977919,138276212047871,267395251830783] |