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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 96 |
| 4 | 1150 |
| 5 | 14981 |
| 6 | 206426 |
| 7 | 2959249 |
| 8 | 43683374 |
| 9 | 659531482 |
| 10 | 10137150414 |
| 11 | 158089344305 |
| 12 | 2495255246353 |
| 13 | 39785814006395 |
| 14 | 639880150931025 |
| 15 | 10368454503796731 |
| 16 | 169106511176489353 |
| 17 | 2773945868018478593 |
| 18 | 45734618620228469488 |
| 19 | 757469141505480597690 |
[1,1,9,96,1150,14981,206426,2959249,43683374, 659531482,10137150414,158089344305,2495255246353, 39785814006395,639880150931025,10368454503796731, 169106511176489353,2773945868018478593, 45734618620228469488,757469141505480597690] |