| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 9 |
| 6 | 18 |
| 7 | 49 |
| 8 | 57 |
| 9 | 67 |
| 10 | 69 |
| 11 | 106 |
| 12 | 126 |
| 13 | 258 |
| 14 | 583 |
| 15 | 1221 |
| 16 | 1366 |
| 17 | 4311 |
| 18 | 11361 |
| 19 | 12621 |
| 20 | 14964 |
| 21 | 16017 |
| 22 | 22467 |
| 23 | 25434 |
| 24 | 45094 |
| 25 | 51051 |
| 26 | 89113 |
[0,1,3,4,9,18,49,57,67,69,106,126,258,583,1221, 1366,4311,11361,12621,14964,16017,22467,25434, 45094,51051,89113] |