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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 43 |
| 5 | 55 |
| 6 | 337 |
| 7 | 1210 |
| 8 | 2692 |
| 9 | 3535 |
| 10 | 3916 |
| 11 | 3973 |
| 12 | 4045 |
| 13 | 6960 |
| 14 | 23770 |
| 15 | 69655 |
[0,1,6,43,55,337,1210,2692,3535,3916,3973,4045, 6960,23770,69655] |