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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 24 |
| 4 | 189 |
| 5 | 2199 |
| 6 | 33495 |
| 7 | 625743 |
| 8 | 13778469 |
| 9 | 348258723 |
| 10 | 9916111584 |
| 11 | 313642702743 |
| 12 | 10901017499472 |
| 13 | 412730651160567 |
| 14 | 16902257604014685 |
| 15 | 744247858158013245 |
| 16 | 35058132248539742325 |
| 17 | 1758994171367292095805 |
| 18 | 93646661943861501833100 |
| 19 | 5272500660870261306912750 |
[1,3,6,24,189,2199,33495,625743,13778469, 348258723,9916111584,313642702743,10901017499472, 412730651160567,16902257604014685, 744247858158013245,35058132248539742325, 1758994171367292095805,93646661943861501833100, 5272500660870261306912750] |