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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 36 |
| 4 | 134 |
| 5 | 450 |
| 6 | 1353 |
| 7 | 3722 |
| 8 | 9529 |
| 9 | 22957 |
| 10 | 52447 |
| 11 | 114282 |
| 12 | 238618 |
| 13 | 479284 |
| 14 | 929223 |
| 15 | 1744166 |
| 16 | 3178057 |
| 17 | 5634919 |
| 18 | 9743313 |
| 19 | 16461342 |
| 20 | 27222342 |
| 21 | 44134038 |
| 22 | 70247085 |
| 23 | 109912626 |
| 24 | 169252849 |
| 25 | 256773585 |
| 26 | 384153835 |
| 27 | 567253826 |
| 28 | 827390858 |
| 29 | 1192940904 |
[4,9,36,134,450,1353,3722,9529,22957,52447,114282, 238618,479284,929223,1744166,3178057,5634919, 9743313,16461342,27222342,44134038,70247085, 109912626,169252849,256773585,384153835,567253826, 827390858,1192940904] |