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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 7 |
| 4 | 19 |
| 5 | 46 |
| 6 | 613 |
| 7 | 1146 |
| 8 | 1500 |
| 9 | 1982 |
| 10 | 2590 |
| 11 | 7278 |
| 12 | 13714 |
| 13 | 15929 |
[4,6,7,19,46,613,1146,1500,1982,2590,7278,13714, 15929] |