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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 12 |
| 8 | 316 |
| 9 | 4961 |
| 10 | 88482 |
| 11 | 1456780 |
| 12 | 24970807 |
| 13 | 430069638 |
| 14 | 7646066285 |
| 15 | 139512608803 |
| 16 | 2630205520242 |
| 17 | 51191324887317 |
| 18 | 1030225266241718 |
| 19 | 21431850533761458 |
| 20 | 460916811387051427 |
| 21 | 10243049068068285706 |
| 22 | 235127217600172319772 |
| 23 | 5571780677576178939683 |
[1,12,316,4961,88482,1456780,24970807,430069638, 7646066285,139512608803,2630205520242, 51191324887317,1030225266241718,21431850533761458, 460916811387051427,10243049068068285706, 235127217600172319772,5571780677576178939683] |