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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 2 |
| 7 | 1 |
| 8 | 7 |
| 9 | 6 |
| 10 | 28 |
| 11 | 27 |
| 12 | 107 |
| 13 | 94 |
| 14 | 488 |
| 15 | 386 |
| 16 | 2066 |
| 17 | 1630 |
| 18 | 8392 |
| 19 | 6780 |
| 20 | 34962 |
| 21 | 28056 |
| 22 | 147356 |
| 23 | 117621 |
| 24 | 622558 |
| 25 | 500525 |
| 26 | 2657666 |
| 27 | 2149374 |
[1,0,2,2,1,7,6,28,27,107,94,488,386,2066,1630, 8392,6780,34962,28056,147356,117621,622558,500525, 2657666,2149374] |