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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 25 |
| 3 | 136 |
| 4 | 715 |
| 5 | 1526 |
| 6 | 11828 |
| 7 | 8121 |
| 8 | 115798 |
| 9 | 319405 |
| 10 | 1771087 |
| 11 | 2179693 |
| 12 | 11665419 |
| 13 | 38160335 |
| 14 | 176024528 |
| 15 | 1367063798 |
| 16 | 3257101805 |
| 17 | 9109186828 |
| 18 | 38598478444 |
| 19 | 136736651535 |
| 20 | 380814792667 |
| 21 | 821922685008 |
[5,25,136,715,1526,11828,8121,115798,319405, 1771087,2179693,11665419,38160335,176024528, 1367063798,3257101805,9109186828,38598478444, 136736651535,380814792667,821922685008] |