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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 5 |
| 6 | 30 |
| 7 | 175 |
| 8 | 1015 |
| 9 | 6111 |
| 10 | 38010 |
| 11 | 244035 |
| 12 | 1624425 |
| 13 | 11187605 |
| 14 | 79695616 |
| 15 | 586787565 |
| 16 | 4460703065 |
| 17 | 34979737625 |
| 18 | 282686608170 |
| 19 | 2352035472141 |
| 20 | 20130594430095 |
| 21 | 177076978131795 |
| 22 | 1599554765785900 |
| 23 | 14826174374092235 |
| 24 | 140904888153964011 |
| 25 | 1372081103132069275 |
[1,5,30,175,1015,6111,38010,244035,1624425, 11187605,79695616,586787565,4460703065, 34979737625,282686608170,2352035472141, 20130594430095,177076978131795,1599554765785900, 14826174374092235,140904888153964011, 1372081103132069275] |