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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 26 |
| 5 | 68 |
| 6 | 175 |
| 7 | 461 |
| 8 | 1225 |
| 9 | 3349 |
| 10 | 9266 |
| 11 | 26516 |
| 12 | 76334 |
| 13 | 221763 |
[1,4,10,26,68,175,461,1225,3349,9266,26516,76334, 221763] |