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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 2 |
| 9 | 2 |
| 10 | 8 |
| 11 | 8 |
| 12 | 32 |
| 13 | 57 |
| 14 | 185 |
| 15 | 466 |
| 16 | 1543 |
| 17 | 4583 |
| 18 | 15374 |
| 19 | 50116 |
| 20 | 171168 |
| 21 | 582603 |
| 22 | 2024119 |
| 23 | 7057472 |
| 24 | 24873248 |
| 25 | 88111772 |
| 26 | 314301078 |
| 27 | 1126716000 |
| 28 | 4060375677 |
| 29 | 14697571234 |
| 30 | 53432834170 |
| 31 | 195015189626 |
| 32 | 714404259151 |
| 33 | 2626130395699 |
[0,0,1,0,1,1,2,2,8,8,32,57,185,466,1543,4583, 15374,50116,171168,582603,2024119,7057472, 24873248,88111772,314301078,1126716000,4060375677, 14697571234,53432834170,195015189626,714404259151, 2626130395699] |