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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 288 |
| 3 | 24444 |
| 4 | 2738592 |
| 5 | 361998432 |
| 6 | 53414223552 |
| 7 | 8525232846072 |
| 8 | 1443209364298944 |
| 9 | 255769050813120576 |
| 10 | 47020653859202576640 |
| 11 | 8907614785269428079168 |
| 12 | 1730208409741026141405696 |
| 13 | 343266632435192859791576064 |
| 14 | 69350551439109880798294334208 |
[1,6,288,24444,2738592,361998432,53414223552, 8525232846072,1443209364298944,255769050813120576, 47020653859202576640,8907614785269428079168, 1730208409741026141405696, 343266632435192859791576064, 69350551439109880798294334208] |