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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 10 |
| 6 | 15 |
| 7 | 105 |
| 8 | 105 |
| 9 | 1260 |
| 10 | 945 |
| 11 | 17325 |
| 12 | 10395 |
| 13 | 270270 |
| 14 | 135135 |
| 15 | 4729725 |
| 16 | 2027025 |
| 17 | 91891800 |
| 18 | 34459425 |
| 19 | 1964187225 |
| 20 | 654729075 |
| 21 | 45831035250 |
| 22 | 13749310575 |
| 23 | 1159525191825 |
| 24 | 316234143225 |
| 25 | 31623414322500 |
| 26 | 7905853580625 |
| 27 | 924984868933125 |
| 28 | 213458046676875 |
| 29 | 28887988983603750 |
| 30 | 6190283353629375 |
[1,1,3,10,15,105,105,1260,945,17325,10395,270270, 135135,4729725,2027025,91891800,34459425, 1964187225,654729075,45831035250,13749310575, 1159525191825,316234143225,31623414322500, 7905853580625,924984868933125,213458046676875, 28887988983603750,6190283353629375] |