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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 3 |
| 7 | 6 |
| 8 | 24 |
| 9 | 44 |
| 10 | 77 |
| 11 | 235 |
| 12 | 620 |
| 13 | 1321 |
| 14 | 3238 |
| 15 | 8791 |
| 16 | 21178 |
| 17 | 52662 |
| 18 | 140814 |
| 19 | 362458 |
| 20 | 927614 |
| 21 | 2437267 |
| 22 | 6376348 |
| 23 | 16629349 |
| 24 | 43733016 |
| 25 | 115226994 |
| 26 | 303620616 |
| 27 | 802665619 |
| 28 | 2127803992 |
| 29 | 5649706174 |
| 30 | 15031089644 |
| 31 | 40077352795 |
[0,0,3,3,6,24,44,77,235,620,1321,3238,8791,21178, 52662,140814,362458,927614,2437267,6376348, 16629349,43733016,115226994,303620616,802665619, 2127803992,5649706174,15031089644,40077352795] |