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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 10 |
| 4 | 21 |
| 5 | 45 |
| 6 | 97 |
| 7 | 207 |
| 8 | 441 |
| 9 | 945 |
| 10 | 2021 |
| 11 | 4327 |
| 12 | 9261 |
| 13 | 19825 |
| 14 | 42440 |
| 15 | 90850 |
| 16 | 194481 |
| 17 | 416325 |
| 18 | 891224 |
| 19 | 1907839 |
| 20 | 4084101 |
| 21 | 8742816 |
| 22 | 18715702 |
| 23 | 40064613 |
| 24 | 85766121 |
| 25 | 183599119 |
| 26 | 393029742 |
| 27 | 841356859 |
| 28 | 1801088541 |
[1,3,5,10,21,45,97,207,441,945,2021,4327,9261, 19825,42440,90850,194481,416325,891224,1907839, 4084101,8742816,18715702,40064613,85766121, 183599119,393029742,841356859,1801088541] |