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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 34 |
| 4 | 561 |
| 5 | 5087 |
| 6 | 30569 |
| 7 | 138103 |
| 8 | 507360 |
| 9 | 1594272 |
| 10 | 4433484 |
| 11 | 11176033 |
| 12 | 25989535 |
| 13 | 56493801 |
| 14 | 115960208 |
| 15 | 226569266 |
| 16 | 424098592 |
| 17 | 764503872 |
| 18 | 1332959307 |
| 19 | 2256042444 |
| 20 | 3717882133 |
| 21 | 5981238571 |
| 22 | 9414651939 |
| 23 | 14526981953 |
| 24 | 22010865680 |
| 25 | 32796846160 |
[1,34,561,5087,30569,138103,507360,1594272, 4433484,11176033,25989535,56493801,115960208, 226569266,424098592,764503872,1332959307, 2256042444,3717882133,5981238571,9414651939, 14526981953,22010865680,32796846160] |