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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 18 |
| 8 | 45 |
| 9 | 116 |
| 10 | 298 |
| 11 | 776 |
| 12 | 2025 |
| 13 | 5322 |
| 14 | 14030 |
| 15 | 37155 |
| 16 | 98685 |
| 17 | 262961 |
| 18 | 702497 |
| 19 | 1881475 |
| 20 | 5050140 |
| 21 | 13583622 |
| 22 | 36605565 |
| 23 | 98821445 |
| 24 | 267220361 |
| 25 | 723704046 |
| 26 | 1962830775 |
| 27 | 5330900916 |
| 28 | 14497096134 |
| 29 | 39472561082 |
| 30 | 107601053713 |
| 31 | 293643574776 |
| 32 | 802203904616 |
| 33 | 2193758306687 |
[1,1,3,7,18,45,116,298,776,2025,5322,14030,37155, 98685,262961,702497,1881475,5050140,13583622, 36605565,98821445,267220361,723704046,1962830775, 5330900916,14497096134,39472561082,107601053713, 293643574776,802203904616,2193758306687] |