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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 292 |
| 4 | 1298 |
| 5 | 5172 |
| 6 | 20316 |
| 7 | 77752 |
| 8 | 295720 |
| 9 | 1117080 |
| 10 | 4209924 |
| 11 | 15835990 |
| 12 | 59521532 |
| 13 | 223600028 |
| 14 | 839772726 |
| 15 | 3153450118 |
| 16 | 11840705184 |
| 17 | 44458053838 |
| 18 | 166922053694 |
| 19 | 626717259422 |
| 20 | 2353026409758 |
| 21 | 8834468527674 |
| 22 | 33169066709822 |
| 23 | 124533341936372 |
[8,64,292,1298,5172,20316,77752,295720,1117080, 4209924,15835990,59521532,223600028,839772726, 3153450118,11840705184,44458053838,166922053694, 626717259422,2353026409758,8834468527674, 33169066709822,124533341936372] |