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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 24 |
| 4 | 105 |
| 5 | 405 |
| 6 | 1617 |
| 7 | 6412 |
| 8 | 25449 |
| 9 | 101029 |
| 10 | 400986 |
| 11 | 1591697 |
| 12 | 6317904 |
| 13 | 25077948 |
| 14 | 99542634 |
| 15 | 395117919 |
| 16 | 1568354512 |
| 17 | 6225321052 |
| 18 | 24710371599 |
| 19 | 98083689723 |
| 20 | 389326813396 |
| 21 | 1545367714146 |
| 22 | 6134078853549 |
| 23 | 24348200775585 |
| 24 | 96646113488531 |
[1,8,24,105,405,1617,6412,25449,101029,400986, 1591697,6317904,25077948,99542634,395117919, 1568354512,6225321052,24710371599,98083689723, 389326813396,1545367714146,6134078853549, 24348200775585,96646113488531] |