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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 35 |
| 3 | 245 |
| 4 | 1715 |
| 5 | 12005 |
| 6 | 84035 |
| 7 | 588245 |
| 8 | 4117715 |
| 9 | 28824005 |
| 10 | 201768035 |
| 11 | 1412376245 |
| 12 | 9886633715 |
| 13 | 69206436005 |
| 14 | 484445052035 |
| 15 | 3391115364245 |
| 16 | 23737807549715 |
| 17 | 166164652848005 |
| 18 | 1163152569936035 |
| 19 | 8142067989552245 |
| 20 | 56994475926865715 |
| 21 | 398961331488060005 |
[1,5,35,245,1715,12005,84035,588245,4117715, 28824005,201768035,1412376245,9886633715, 69206436005,484445052035,3391115364245, 23737807549715,166164652848005,1163152569936035, 8142067989552245,56994475926865715, 398961331488060005] |