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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 33 |
| 3 | 627 |
| 4 | 16929 |
| 5 | 592515 |
| 6 | 25478145 |
| 7 | 1299385395 |
| 8 | 76663738305 |
| 9 | 5136470466435 |
| 10 | 385235284982625 |
| 11 | 31974528653557875 |
| 12 | 2909682107473766625 |
| 13 | 288058528639902895875 |
| 14 | 30822262564469609858625 |
| 15 | 3544560194914005133741875 |
| 16 | 435980903974422631450250625 |
| 17 | 57113498420649364719982831875 |
[1,3,33,627,16929,592515,25478145,1299385395, 76663738305,5136470466435,385235284982625, 31974528653557875,2909682107473766625, 288058528639902895875,30822262564469609858625, 3544560194914005133741875, 435980903974422631450250625, 57113498420649364719982831875] |