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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 156 |
| 4 | 1995 |
| 5 | 29658 |
| 6 | 495922 |
| 7 | 9140344 |
| 8 | 183201255 |
| 9 | 3954149640 |
| 10 | 91212812647 |
| 11 | 2235185965152 |
| 12 | 57899260705117 |
| 13 | 1578806923315370 |
| 14 | 45158965541429475 |
| 15 | 1350797823601721136 |
| 16 | 42141425201135893387 |
| 17 | 1367978583480857293770 |
[1,2,15,156,1995,29658,495922,9140344,183201255, 3954149640,91212812647,2235185965152, 57899260705117,1578806923315370,45158965541429475, 1350797823601721136,42141425201135893387, 1367978583480857293770] |