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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 1440 |
| 4 | 36288000 |
| 5 | 184354652160000 |
| 6 | 309071606732292096000000 |
| 7 | 254046582743105184577722777600000000 |
| 8 | 142518177743863255019484504453155074867200000000000 |
[1,1,6,1440,36288000,184354652160000, 309071606732292096000000, 254046582743105184577722777600000000, 14251817774386325501948450445315507486720000000000\ 0] |