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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 61 |
| 11 | 248 |
| 12 | 1219 |
| 13 | 8302 |
| 14 | 40919 |
| 15 | 212586 |
| 16 | 1454728 |
| 17 | 13983083 |
| 18 | 157730943 |
| 19 | 1851906541 |
| 20 | 23225168793 |
| 21 | 351573878630 |
| 22 | 6540083828707 |
[1,7,19,37,61,248,1219,8302,40919,212586,1454728, 13983083,157730943,1851906541,23225168793, 351573878630,6540083828707] |