| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 40 |
| 2 | 1005 |
| 3 | 20300 |
| 4 | 360521 |
| 5 | 5881680 |
| 6 | 90375685 |
| 7 | 1328528500 |
| 8 | 18879767841 |
| 9 | 261281940920 |
| 10 | 3540146411165 |
| 11 | 47147861315100 |
| 12 | 619093593987961 |
| 13 | 8034113714073760 |
| 14 | 103234967777291445 |
| 15 | 1315472793832108100 |
[1,40,1005,20300,360521,5881680,90375685, 1328528500,18879767841,261281940920,3540146411165, 47147861315100,619093593987961,8034113714073760, 103234967777291445,1315472793832108100] |