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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 6 |
| 3 | 46 |
| 4 | 174 |
| 5 | 689 |
| 6 | 2482 |
| 7 | 8744 |
| 8 | 30122 |
| 9 | 101738 |
| 10 | 333863 |
| 11 | 1060075 |
| 12 | 3255831 |
| 13 | 9692064 |
| 14 | 28025330 |
| 15 | 78861460 |
| 16 | 216288179 |
| 17 | 578998244 |
| 18 | 1514942606 |
| 19 | 3879328902 |
| 20 | 9733779695 |
| 21 | 23957650511 |
| 22 | 57898956666 |
| 23 | 137513675891 |
| 24 | 321232670338 |
| 25 | 738605315409 |
[6,6,46,174,689,2482,8744,30122,101738,333863, 1060075,3255831,9692064,28025330,78861460, 216288179,578998244,1514942606,3879328902, 9733779695,23957650511,57898956666,137513675891, 321232670338,738605315409] |