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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 14367744720 |
| 3 | 607807501825156719166080 |
| 4 | 3502030404249297872766171625530047385600 |
| 5 | 826383627873354098496906047829953892578069546869459968000 |
[1,14367744720,607807501825156719166080, 3502030404249297872766171625530047385600, 82638362787335409849690604782995389257806954686945\ 9968000] |