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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 13 |
| 6 | 37 |
| 7 | 73 |
| 8 | 309 |
| 9 | 2413 |
| 10 | 28415 |
| 11 | 205131 |
| 12 | 1898471 |
| 13 | 29029014 |
| 14 | 631146446 |
| 15 | 14579044094 |
| 16 | 368315888227 |
| 17 | 12424744049760 |
| 18 | 572778669577292 |
[1,13,37,73,309,2413,28415,205131,1898471, 29029014,631146446,14579044094,368315888227, 12424744049760,572778669577292] |