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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 10 |
| 6 | 10 |
| 7 | 22 |
| 8 | 28 |
| 9 | 64 |
| 10 | 76 |
| 11 | 180 |
| 12 | 260 |
| 13 | 606 |
| 14 | 932 |
| 15 | 2124 |
| 16 | 3440 |
| 17 | 7666 |
| 18 | 12872 |
| 19 | 28178 |
| 20 | 48620 |
| 21 | 104946 |
| 22 | 184756 |
| 23 | 394638 |
| 24 | 705432 |
| 25 | 1494600 |
| 26 | 2704156 |
| 27 | 5693376 |
| 28 | 10400600 |
[1,3,4,10,10,22,28,64,76,180,260,606,932,2124, 3440,7666,12872,28178,48620,104946,184756,394638, 705432,1494600,2704156,5693376,10400600] |