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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 288 |
| 4 | 5841 |
| 5 | 158148 |
| 6 | 5370003 |
| 7 | 219641922 |
| 8 | 10518990129 |
| 9 | 577629889848 |
| 10 | 35788733371179 |
| 11 | 2470154920005798 |
| 12 | 187970878034549001 |
| 13 | 15636177199793409444 |
| 14 | 1411635193678825868979 |
| 15 | 137469669176542404342042 |
| 16 | 14364540773583252035937633 |
[1,3,21,288,5841,158148,5370003,219641922, 10518990129,577629889848,35788733371179, 2470154920005798,187970878034549001, 15636177199793409444,1411635193678825868979, 137469669176542404342042, 14364540773583252035937633] |