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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 106 |
| 4 | 2509 |
| 5 | 80956 |
| 6 | 3313579 |
| 7 | 164514904 |
| 8 | 9608077945 |
| 9 | 645470256592 |
| 10 | 49038954301711 |
| 11 | 4157529546929056 |
| 12 | 389125813949115973 |
| 13 | 39853422352958799040 |
| 14 | 4433527105413108692851 |
| 15 | 532370587431255626482816 |
[1,1,7,106,2509,80956,3313579,164514904, 9608077945,645470256592,49038954301711, 4157529546929056,389125813949115973, 39853422352958799040,4433527105413108692851, 532370587431255626482816] |