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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 622 |
| 4 | 27944 |
| 5 | 1905482 |
| 6 | 182347044 |
| 7 | 23219007502 |
| 8 | 3785452962224 |
| 9 | 767440357144082 |
| 10 | 189091470902634684 |
| 11 | 55586950224109363222 |
| 12 | 19201372121239603122824 |
| 13 | 7694882454025442035178522 |
[1,2,24,622,27944,1905482,182347044,23219007502, 3785452962224,767440357144082,189091470902634684, 55586950224109363222,19201372121239603122824, 7694882454025442035178522] |