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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 10 |
| 3 | 18 |
| 4 | 652 |
| 5 | 1299 |
| 6 | 8225 |
| 7 | 12949 |
| 8 | 56230 |
| 9 | 156277 |
| 10 | 3227298 |
| 11 | 144225157 |
[4,10,18,652,1299,8225,12949,56230,156277,3227298, 144225157] |