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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 13 |
| 7 | 28 |
| 8 | 129 |
| 9 | 586 |
| 10 | 2176 |
| 11 | 14358 |
| 12 | 112046 |
| 13 | 791851 |
| 14 | 8217946 |
| 15 | 101868365 |
| 16 | 1252862099 |
| 17 | 20806137393 |
[1,4,13,28,129,586,2176,14358,112046,791851, 8217946,101868365,1252862099,20806137393] |