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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 11 |
| 7 | 16 |
| 8 | 27 |
| 9 | 44 |
| 10 | 73 |
| 11 | 124 |
| 12 | 199 |
| 13 | 372 |
| 14 | 613 |
| 15 | 1142 |
| 16 | 1874 |
| 17 | 3926 |
| 18 | 6209 |
| 19 | 13660 |
| 20 | 21539 |
| 21 | 46240 |
| 22 | 80142 |
[1,2,4,6,11,16,27,44,73,124,199,372,613,1142,1874, 3926,6209,13660,21539,46240,80142] |