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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 60 |
| 4 | 1060 |
| 5 | 23430 |
| 6 | 602001 |
| 7 | 17281760 |
| 8 | 541258390 |
| 9 | 18210836060 |
| 10 | 651246905140 |
| 11 | 24566101401035 |
| 12 | 971933892729980 |
| 13 | 40156993344526860 |
| 14 | 1726753293393763625 |
| 15 | 77065076699967844390 |
| 16 | 3561820706538663354320 |
| 17 | 170162336673835615653925 |
[1,1,5,60,1060,23430,602001,17281760,541258390, 18210836060,651246905140,24566101401035, 971933892729980,40156993344526860, 1726753293393763625,77065076699967844390, 3561820706538663354320,170162336673835615653925] |