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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 251 |
| 4 | 16496 |
| 5 | 2083824 |
| 6 | 453803984 |
| 7 | 156304214576 |
| 8 | 80272385155584 |
| 9 | 58631012094472704 |
| 10 | 58713787327403063808 |
| 11 | 78225670182020153384448 |
| 12 | 135277046518915274471718912 |
| 13 | 297374407080303931562525442048 |
| 14 | 816367902369725640298981464096768 |
[1,1,9,251,16496,2083824,453803984,156304214576, 80272385155584,58631012094472704, 58713787327403063808,78225670182020153384448, 135277046518915274471718912, 297374407080303931562525442048, 816367902369725640298981464096768] |