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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 24 |
| 3 | 162 |
| 4 | 670 |
| 5 | 4456 |
| 6 | 8942 |
| 7 | 44470 |
| 8 | 98902 |
| 9 | 259114 |
| 10 | 438552 |
| 11 | 1330566 |
| 12 | 1897164 |
| 13 | 4893752 |
| 14 | 7246502 |
| 15 | 11544278 |
| 16 | 17678880 |
[6,24,162,670,4456,8942,44470,98902,259114,438552, 1330566,1897164,4893752,7246502,11544278,17678880] |