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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 25 |
| 5 | 73 |
| 6 | 204 |
| 7 | 565 |
| 8 | 1557 |
| 9 | 4275 |
| 10 | 11710 |
| 11 | 32022 |
| 12 | 87464 |
| 13 | 238692 |
[0,1,2,8,25,73,204,565,1557,4275,11710,32022, 87464,238692] |