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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 35 |
| 3 | 320 |
| 4 | 3415 |
| 5 | 39805 |
| 6 | 490660 |
| 7 | 6288120 |
| 8 | 82935615 |
| 9 | 1118324655 |
| 10 | 15346920635 |
| 11 | 213637539620 |
| 12 | 3009391426340 |
| 13 | 42817011909180 |
| 14 | 614411343795960 |
| 15 | 8881874095390320 |
| 16 | 129224763346019215 |
| 17 | 1890813939312392755 |
| 18 | 27805864640943573385 |
| 19 | 410748152876389349720 |
[1,5,35,320,3415,39805,490660,6288120,82935615, 1118324655,15346920635,213637539620,3009391426340, 42817011909180,614411343795960,8881874095390320, 129224763346019215,1890813939312392755, 27805864640943573385,410748152876389349720] |