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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 7 |
| 6 | 16 |
| 7 | 17 |
| 8 | 28 |
| 9 | 70 |
| 10 | 85 |
| 11 | 125 |
| 12 | 392 |
| 13 | 379 |
| 14 | 704 |
| 15 | 3359 |
| 16 | 2248 |
| 17 | 4111 |
| 18 | 18510 |
| 19 | 14309 |
| 20 | 30820 |
[0,1,3,4,7,16,17,28,70,85,125,392,379,704,3359, 2248,4111,18510,14309,30820] |