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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 8 |
| 5 | 31 |
| 6 | 55 |
| 7 | 203 |
| 8 | 368 |
| 9 | 1345 |
| 10 | 2449 |
| 11 | 8933 |
| 12 | 16280 |
| 13 | 59359 |
| 14 | 108199 |
| 15 | 394475 |
| 16 | 719072 |
| 17 | 2621569 |
| 18 | 4778785 |
| 19 | 17422277 |
| 20 | 31758632 |
| 21 | 115784095 |
| 22 | 211059991 |
| 23 | 769472267 |
| 24 | 1402652240 |
| 25 | 5113721281 |
| 26 | 9321678001 |
| 27 | 33984519845 |
| 28 | 61949553848 |
| 29 | 225852667231 |
[0,1,1,5,8,31,55,203,368,1345,2449,8933,16280, 59359,108199,394475,719072,2621569,4778785, 17422277,31758632,115784095,211059991,769472267, 1402652240,5113721281,9321678001,33984519845, 61949553848,225852667231] |