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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 15 |
| 7 | 144 |
| 8 | 35 |
| 9 | 5760 |
| 10 | 315 |
| 11 | 5600 |
| 12 | 693 |
| 13 | 43545600 |
| 14 | 1001 |
| 15 | 6706022400 |
| 16 | 6435 |
| 17 | 14014 |
| 18 | 109395 |
| 19 | 376610217984000 |
| 20 | 46189 |
| 21 | 128047474114560000 |
| 22 | 323323 |
| 23 | 2540395 |
| 24 | 2028117 |
| 25 | 26976017466662584320000 |
| 26 | 96577 |
| 27 | 3241475864250624 |
| 28 | 35102025 |
| 29 | 2126818694000 |
| 30 | 5386025 |
[1,1,2,3,8,15,144,35,5760,315,5600,693,43545600, 1001,6706022400,6435,14014,109395,376610217984000, 46189,128047474114560000,323323,2540395,2028117, 26976017466662584320000,96577,3241475864250624, 35102025,2126818694000,5386025] |