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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 9 |
| 3 | 42 |
| 4 | 173 |
| 5 | 846 |
| 6 | 4177 |
| 7 | 21691 |
| 8 | 114911 |
| 9 | 622910 |
| 10 | 3428951 |
| 11 | 19138401 |
| 12 | 108003785 |
| 13 | 615344844 |
| 14 | 3534413525 |
| 15 | 20444816044 |
| 16 | 118994823449 |
| 17 | 696370777980 |
| 18 | 4095034311841 |
| 19 | 24185709305851 |
| 20 | 143402427296079 |
| 21 | 853276282454676 |
[1,5,9,42,173,846,4177,21691,114911,622910, 3428951,19138401,108003785,615344844,3534413525, 20444816044,118994823449,696370777980, 4095034311841,24185709305851,143402427296079, 853276282454676] |