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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 26 |
| 5 | 66 |
| 6 | 74 |
| 7 | 233 |
| 8 | 473 |
| 9 | 540 |
| 10 | 2774 |
| 11 | 64715 |
| 12 | 102492 |
| 13 | 141594 |
[1,2,8,26,66,74,233,473,540,2774,64715,102492, 141594] |