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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 57 |
| 4 | 796 |
| 5 | 15145 |
| 6 | 374526 |
| 7 | 11669665 |
| 8 | 447595800 |
| 9 | 20733553809 |
| 10 | 1141067915290 |
| 11 | 73552752257281 |
| 12 | 5484203261135028 |
| 13 | 467864288815609465 |
| 14 | 45236104846954021014 |
| 15 | 4915818294874879570305 |
| 16 | 596044703812665607374256 |
| 17 | 80118478395137652912476449 |
| 18 | 11870487496575403846760198322 |
[1,1,6,57,796,15145,374526,11669665,447595800, 20733553809,1141067915290,73552752257281, 5484203261135028,467864288815609465, 45236104846954021014,4915818294874879570305, 596044703812665607374256, 80118478395137652912476449, 11870487496575403846760198322] |