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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 1536 |
| 6 | 7680 |
| 7 | 8806025134080 |
| 8 | 61642175938560 |
| 9 | 2168841254587541957294161920 |
| 10 | 7562281854741110985626291951024209920 |
| 11 | 1362299589723309231779453337910253309054734620740812800000000 |
[1,1,1,2,6,1536,7680,8806025134080,61642175938560, 2168841254587541957294161920, 7562281854741110985626291951024209920, 13622995897233092317794533379102533090547346207408\ 12800000000] |