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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 61 |
| 10 | 206 |
| 11 | 1719 |
| 12 | 10790 |
| 13 | 47817 |
| 14 | 214975 |
| 15 | 1559070 |
| 16 | 18834488 |
| 17 | 235320165 |
| 18 | 2540394252 |
| 19 | 29093246624 |
| 20 | 443617991373 |
| 21 | 9324012818913 |
[1,7,19,37,61,206,1719,10790,47817,214975,1559070, 18834488,235320165,2540394252,29093246624, 443617991373,9324012818913] |