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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 61 |
| 3 | 756 |
| 4 | 10406 |
| 5 | 152880 |
| 6 | 2348164 |
| 7 | 37250298 |
| 8 | 605592377 |
| 9 | 10036783746 |
| 10 | 168947499695 |
| 11 | 2880456168330 |
| 12 | 49638925087101 |
| 13 | 863251245610368 |
| 14 | 15130529347412496 |
| 15 | 267011151724625220 |
| 16 | 4740245924729076390 |
| 17 | 84599747038748783220 |
| 18 | 1516992745930706932654 |
[1,6,61,756,10406,152880,2348164,37250298, 605592377,10036783746,168947499695,2880456168330, 49638925087101,863251245610368,15130529347412496, 267011151724625220,4740245924729076390, 84599747038748783220,1516992745930706932654] |