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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 28 |
| 6 | 137 |
| 7 | 210 |
| 8 | 692 |
| 9 | 717 |
| 10 | 933 |
| 11 | 3138 |
| 12 | 3213 |
| 13 | 3416 |
| 14 | 3467 |
| 15 | 3538 |
| 16 | 16068 |
[0,1,2,3,28,137,210,692,717,933,3138,3213,3416, 3467,3538,16068] |