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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 4 |
| 8 | 8 |
| 9 | 12 |
| 10 | 22 |
| 11 | 36 |
| 12 | 63 |
| 13 | 107 |
| 14 | 188 |
| 15 | 327 |
| 16 | 578 |
| 17 | 1020 |
| 18 | 1820 |
| 19 | 3248 |
| 20 | 5839 |
| 21 | 10511 |
| 22 | 19022 |
| 23 | 34484 |
| 24 | 62755 |
| 25 | 114421 |
| 26 | 209234 |
| 27 | 383327 |
| 28 | 703901 |
| 29 | 1294822 |
| 30 | 2386376 |
| 31 | 4405083 |
| 32 | 8144701 |
| 33 | 15080416 |
| 34 | 27961728 |
| 35 | 51912054 |
| 36 | 96496481 |
| 37 | 179577543 |
| 38 | 334558479 |
| 39 | 623936240 |
| 40 | 1164765120 |
[1,1,3,4,8,12,22,36,63,107,188,327,578,1020,1820, 3248,5839,10511,19022,34484,62755,114421,209234, 383327,703901,1294822,2386376,4405083,8144701, 15080416,27961728,51912054,96496481,179577543, 334558479,623936240,1164765120] |