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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 30 |
| 3 | 4410 |
| 4 | 1837080 |
| 5 | 1660289400 |
| 6 | 2778905329200 |
| 7 | 7757931431250000 |
| 8 | 33536835305077104000 |
| 9 | 212373276256391153904000 |
| 10 | 1887114765997607482496160000 |
| 11 | 22736049196010108202227823840000 |
| 12 | 361148501823912048339843750000000000 |
| 13 | 7389146090843722060953495522716592000000 |
| 14 | 190939093198813987007780146685866111584000000 |
[1,1,30,4410,1837080,1660289400,2778905329200, 7757931431250000,33536835305077104000, 212373276256391153904000, 1887114765997607482496160000, 22736049196010108202227823840000, 361148501823912048339843750000000000, 7389146090843722060953495522716592000000, 190939093198813987007780146685866111584000000] |