| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 5 |
| 4 | 25 |
| 5 | 357 |
| 6 | 4765 |
| 7 | 90553 |
| 8 | 3100249 |
| 9 | 146194232 |
| 10 | 11993787067 |
| 11 | 1839157793733 |
| 12 | 369768109497405 |
| 13 | 136403046959201932 |
| 14 | 67251730314890513141 |
| 15 | 66275214154448397358578 |
| 16 | 79949861700558334494500876 |
[1,4,5,25,357,4765,90553,3100249,146194232, 11993787067,1839157793733,369768109497405, 136403046959201932,67251730314890513141, 66275214154448397358578, 79949861700558334494500876] |