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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 735 |
| 4 | 76545 |
| 5 | 13835745 |
| 6 | 3859590735 |
| 7 | 1539272109375 |
| 8 | 831766748637825 |
| 9 | 585243816844111425 |
| 10 | 520038240188935042575 |
| 11 | 569585968715180280038175 |
| 12 | 753960950911045074462890625 |
| 13 | 1186626209895384011075327630625 |
| 14 | 2190213762744801162239116550679375 |
[1,1,15,735,76545,13835745,3859590735, 1539272109375,831766748637825,585243816844111425, 520038240188935042575,569585968715180280038175, 753960950911045074462890625, 1186626209895384011075327630625, 2190213762744801162239116550679375] |