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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 30 |
| 4 | 35 |
| 5 | 70 |
| 6 | 77 |
| 7 | 3003 |
| 8 | 1430 |
| 9 | 24310 |
| 10 | 230945 |
| 11 | 969969 |
| 12 | 4056234 |
| 13 | 676039 |
| 14 | 312018 |
| 15 | 1292646 |
| 16 | 33393355 |
| 17 | 2203961430 |
| 18 | 90751353 |
| 19 | 3357800061 |
| 20 | 1531628098 |
| 21 | 156991880045 |
| 22 | 5786272150230 |
| 23 | 105204948186 |
| 24 | 107492012277 |
| 25 | 35830670759 |
| 26 | 3654728417418 |
| 27 | 14900046624858 |
[1,6,30,35,70,77,3003,1430,24310,230945,969969, 4056234,676039,312018,1292646,33393355,2203961430, 90751353,3357800061,1531628098,156991880045, 5786272150230,105204948186,107492012277, 35830670759,3654728417418,14900046624858] |