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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 6 |
| 5 | 27 |
| 6 | 92 |
| 7 | 279 |
| 8 | 762 |
| 9 | 1952 |
| 10 | 4725 |
| 11 | 10968 |
| 12 | 24551 |
| 13 | 53346 |
| 14 | 112932 |
| 15 | 233755 |
| 16 | 474288 |
| 17 | 945384 |
| 18 | 1854517 |
| 19 | 3585534 |
| 20 | 6841182 |
| 21 | 12895246 |
| 22 | 24035841 |
| 23 | 44337672 |
| 24 | 80999765 |
| 25 | 146644746 |
| 26 | 263249169 |
| 27 | 468817933 |
| 28 | 828658233 |
| 29 | 1454315508 |
| 30 | 2535217624 |
| 31 | 4391290854 |
| 32 | 7560034419 |
| 33 | 12939963016 |
[1,6,27,92,279,762,1952,4725,10968,24551,53346, 112932,233755,474288,945384,1854517,3585534, 6841182,12895246,24035841,44337672,80999765, 146644746,263249169,468817933,828658233, 1454315508,2535217624,4391290854,7560034419, 12939963016] |