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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 7 |
| 6 | 19 |
| 7 | 20 |
| 8 | 28 |
| 9 | 58 |
| 10 | 250 |
| 11 | 397 |
| 12 | 7591 |
| 13 | 32716 |
| 14 | 70978 |
| 15 | 83587 |
| 16 | 140693 |
[0,1,2,5,7,19,20,28,58,250,397,7591,32716,70978, 83587,140693] |