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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 38 |
| 3 | 1158 |
| 4 | 65304 |
| 5 | 5900520 |
| 6 | 780827760 |
| 7 | 142358474160 |
| 8 | 34209760152960 |
| 9 | 10478436416945280 |
| 10 | 3984884716852972800 |
| 11 | 1842169367191937414400 |
| 12 | 1017403495472574045158400 |
| 13 | 661599650478455071589606400 |
| 14 | 500354503197888042597961267200 |
| 15 | 435447353708763072625260119808000 |
[1,3,38,1158,65304,5900520,780827760,142358474160, 34209760152960,10478436416945280, 3984884716852972800,1842169367191937414400, 1017403495472574045158400, 661599650478455071589606400, 500354503197888042597961267200, 435447353708763072625260119808000] |