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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 182509367040000 |
| 8 | 712008996110160366168717566400 |
| 9 | 7664603814657718197913972357390335773198400000 |
| 10 | 299436894513044390420517533660659195248061275496427347927110000 |
[0,0,0,0,0,1,182509367040000, 712008996110160366168717566400, 7664603814657718197913972357390335773198400000, 29943689451304439042051753366065919524806127549642\ 7347927110000] |