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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 80 |
| 4 | 1368 |
| 5 | 45344 |
| 6 | 2952208 |
| 7 | 381005824 |
| 8 | 97928967168 |
| 9 | 50238812700672 |
| 10 | 51495089926791168 |
| 11 | 105513593089512439808 |
| 12 | 432289346894817079853056 |
| 13 | 3541746937174189008054386688 |
| 14 | 58031524865557213409213540204544 |
[1,2,9,80,1368,45344,2952208,381005824, 97928967168,50238812700672,51495089926791168, 105513593089512439808,432289346894817079853056, 3541746937174189008054386688, 58031524865557213409213540204544] |