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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 133 |
| 10 | 535 |
| 11 | 2615 |
| 12 | 17641 |
| 13 | 119940 |
| 14 | 924944 |
| 15 | 8924108 |
| 16 | 102805254 |
| 17 | 1407633936 |
| 18 | 22958195053 |
| 19 | 437437783099 |
[1,7,19,37,133,535,2615,17641,119940,924944, 8924108,102805254,1407633936,22958195053, 437437783099] |