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| n | a(n) |
|---|---|
| 11 | 1 |
| 12 | 1 |
| 13 | 6 |
| 14 | 16 |
| 15 | 56 |
| 16 | 147 |
| 17 | 392 |
| 18 | 912 |
| 19 | 2052 |
| 20 | 4262 |
| 21 | 8524 |
| 22 | 16159 |
| 23 | 29624 |
| 24 | 52234 |
| 25 | 89544 |
| 26 | 148976 |
| 27 | 242086 |
| 28 | 384111 |
| 29 | 597506 |
| 30 | 911456 |
| 31 | 1367184 |
| 32 | 2017509 |
| 33 | 2934559 |
| 34 | 4209504 |
| 35 | 5963464 |
| 36 | 8347612 |
| 37 | 11558232 |
| 38 | 15837472 |
| 39 | 21493712 |
| 40 | 28903332 |
[1,1,6,16,56,147,392,912,2052,4262,8524,16159, 29624,52234,89544,148976,242086,384111,597506, 911456,1367184,2017509,2934559,4209504,5963464, 8347612,11558232,15837472,21493712,28903332] |