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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 80 |
| 4 | 3680 |
| 5 | 300800 |
| 6 | 38233600 |
| 7 | 6960179200 |
| 8 | 1715803648000 |
| 9 | 549927772160000 |
| 10 | 222172054667264000 |
| 11 | 110418310176112640000 |
| 12 | 66193620737183580160000 |
| 13 | 47093975714823012352000000 |
| 14 | 39225810499489538768896000000 |
| 15 | 37809201187185822383734784000000 |
| 16 | 41754105224509634604034949120000000 |
[1,4,80,3680,300800,38233600,6960179200, 1715803648000,549927772160000,222172054667264000, 110418310176112640000,66193620737183580160000, 47093975714823012352000000, 39225810499489538768896000000, 37809201187185822383734784000000, 41754105224509634604034949120000000] |