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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 9 |
| 7 | 21 |
| 8 | 28 |
| 9 | 67 |
| 10 | 85 |
| 11 | 170 |
| 12 | 156 |
| 13 | 364 |
| 14 | 385 |
| 15 | 690 |
| 16 | 696 |
| 17 | 1198 |
| 18 | 927 |
| 19 | 1947 |
| 20 | 1930 |
| 21 | 3003 |
| 22 | 2981 |
[1,2,5,9,21,28,67,85,170,156,364,385,690,696,1198, 927,1947,1930,3003,2981] |