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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 27 |
| 3 | 195 |
| 4 | 1785 |
| 5 | 19845 |
| 6 | 259875 |
| 7 | 3918915 |
| 8 | 66891825 |
| 9 | 1274998725 |
| 10 | 26843892075 |
| 11 | 618718975875 |
| 12 | 15495473018025 |
| 13 | 419010239773125 |
| 14 | 12167108660581875 |
| 15 | 377607284571391875 |
| 16 | 12473420957563190625 |
| 17 | 436953531082636693125 |
| 18 | 16179945969799083346875 |
| 19 | 631461179013117650071875 |
[1,5,27,195,1785,19845,259875,3918915,66891825, 1274998725,26843892075,618718975875, 15495473018025,419010239773125,12167108660581875, 377607284571391875,12473420957563190625, 436953531082636693125,16179945969799083346875, 631461179013117650071875] |