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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 7 |
| 6 | 18 |
| 7 | 21 |
| 8 | 70 |
| 9 | 76 |
| 10 | 323 |
| 11 | 340 |
| 12 | 556 |
| 13 | 572 |
| 14 | 3433 |
| 15 | 5457 |
| 16 | 5897 |
| 17 | 10820 |
[1,2,3,4,7,18,21,70,76,323,340,556,572,3433,5457, 5897,10820] |