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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 22 |
| 4 | 141 |
| 5 | 561 |
| 6 | 3291 |
| 7 | 15583 |
| 8 | 88691 |
| 9 | 459187 |
| 10 | 2599570 |
| 11 | 14136200 |
| 12 | 80391235 |
| 13 | 450046143 |
| 14 | 2579291352 |
| 15 | 14710321998 |
| 16 | 85002979083 |
| 17 | 491050703739 |
| 18 | 2859262171872 |
| 19 | 16674374605722 |
| 20 | 97747766045679 |
| 21 | 574231140306699 |
| 22 | 3385974360904227 |
| 23 | 20009363692187115 |
| 24 | 118582649963026677 |
[1,1,8,22,141,561,3291,15583,88691,459187,2599570, 14136200,80391235,450046143,2579291352, 14710321998,85002979083,491050703739, 2859262171872,16674374605722,97747766045679, 574231140306699,3385974360904227, 20009363692187115,118582649963026677] |