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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5040 |
| 3 | 101606400 |
| 4 | 6145155072000 |
| 5 | 929147446886400000 |
| 6 | 309071606732292096000000 |
| 7 | 205619158526859285626880000000 |
| 8 | 254046582743105184577722777600000000 |
| 9 | 549289359343832305886569080815616000000000 |
| 10 | 1979419135331434097492840339627153817600000000000 |
[1,5040,101606400,6145155072000, 929147446886400000,309071606732292096000000, 205619158526859285626880000000, 254046582743105184577722777600000000, 549289359343832305886569080815616000000000, 1979419135331434097492840339627153817600000000000] |