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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 41 |
| 4 | 1081 |
| 5 | 26515 |
| 6 | 674292 |
| 7 | 17720400 |
| 8 | 471468756 |
| 9 | 12570253556 |
| 10 | 335101401877 |
| 11 | 8932110760401 |
| 12 | 238088717357193 |
| 13 | 6346541968642151 |
| 14 | 169176879483125528 |
| 15 | 4509681115981777876 |
| 16 | 120212775466066851264 |
| 17 | 3204464007623702644476 |
| 18 | 85420126381414152110475 |
| 19 | 2277010595175522782497635 |
[1,41,1081,26515,674292,17720400,471468756, 12570253556,335101401877,8932110760401, 238088717357193,6346541968642151, 169176879483125528,4509681115981777876, 120212775466066851264,3204464007623702644476, 85420126381414152110475,2277010595175522782497635] |