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| n | a(n) |
|---|---|
| 3 | 2 |
| 4 | 5 |
| 5 | 34 |
| 6 | 98 |
| 7 | 496 |
| 8 | 1545 |
| 9 | 7010 |
| 10 | 22924 |
| 11 | 98636 |
| 12 | 333463 |
| 13 | 1393014 |
| 14 | 4824350 |
| 15 | 19795200 |
| 16 | 69818507 |
| 17 | 283195638 |
| 18 | 1013208668 |
| 19 | 4078132240 |
| 20 | 14758843463 |
| 21 | 59087809638 |
| 22 | 215859015800 |
| 23 | 860951003152 |
| 24 | 3169965920150 |
| 25 | 12609168181324 |
| 26 | 46735070397768 |
| 27 | 185532421441976 |
| 28 | 691582241867227 |
[2,5,34,98,496,1545,7010,22924,98636,333463, 1393014,4824350,19795200,69818507,283195638, 1013208668,4078132240,14758843463,59087809638, 215859015800,860951003152,3169965920150, 12609168181324,46735070397768,185532421441976, 691582241867227] |