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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 43 |
| 3 | 626 |
| 4 | 6732 |
| 5 | 62856 |
| 6 | 539568 |
| 7 | 4377888 |
| 8 | 34105536 |
| 9 | 257634432 |
| 10 | 1899645696 |
| 11 | 13735899648 |
| 12 | 97733495808 |
| 13 | 686049232896 |
| 14 | 4760622968832 |
| 15 | 32708331380736 |
| 16 | 222789318524928 |
| 17 | 1506002505596928 |
| 18 | 10111798278291456 |
| 19 | 67486591206162432 |
[1,43,626,6732,62856,539568,4377888,34105536, 257634432,1899645696,13735899648,97733495808, 686049232896,4760622968832,32708331380736, 222789318524928,1506002505596928, 10111798278291456,67486591206162432] |