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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 22 |
| 2 | 462 |
| 3 | 9471 |
| 4 | 194040 |
| 5 | 3973200 |
| 6 | 81355890 |
| 7 | 1665833400 |
| 8 | 34109413800 |
| 9 | 698420207100 |
| 10 | 14300767404000 |
| 11 | 292820775324000 |
| 12 | 5995762611069000 |
| 13 | 122768506573020000 |
| 14 | 2513793020863740000 |
| 15 | 51472120400410710000 |
[1,22,462,9471,194040,3973200,81355890,1665833400, 34109413800,698420207100,14300767404000, 292820775324000,5995762611069000, 122768506573020000,2513793020863740000, 51472120400410710000] |