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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 9 |
| 3 | 1050 |
| 4 | 531 |
| 5 | 63 |
| 6 | 44520 |
| 7 | 29610 |
| 8 | 6165 |
| 9 | 405 |
| 10 | 2245320 |
| 11 | 1789614 |
| 12 | 502821 |
| 13 | 59454 |
| 14 | 2511 |
| 15 | 131891760 |
| 16 | 120133692 |
| 17 | 41182344 |
| 18 | 6686631 |
| 19 | 517104 |
| 20 | 15309 |
| 21 | 8862693840 |
| 22 | 8966770308 |
| 23 | 3559509360 |
| 24 | 714174327 |
| 25 | 76790673 |
| 26 | 4214349 |
| 27 | 92583 |
[1,30,9,1050,531,63,44520,29610,6165,405,2245320, 1789614,502821,59454,2511,131891760,120133692, 41182344,6686631,517104,15309,8862693840, 8966770308,3559509360,714174327,76790673,4214349, 92583] |