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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 352 |
| 4 | 1479 |
| 5 | 5233 |
| 6 | 16845 |
| 7 | 52532 |
| 8 | 166076 |
| 9 | 545443 |
| 10 | 1866509 |
| 11 | 6584260 |
| 12 | 23605163 |
| 13 | 85081408 |
| 14 | 306598781 |
| 15 | 1103114341 |
| 16 | 3965858837 |
| 17 | 14265857551 |
| 18 | 51394273661 |
| 19 | 185496356237 |
| 20 | 670659535731 |
| 21 | 2428046038680 |
| 22 | 8798879746069 |
| 23 | 31906100994095 |
[8,64,352,1479,5233,16845,52532,166076,545443, 1866509,6584260,23605163,85081408,306598781, 1103114341,3965858837,14265857551,51394273661, 185496356237,670659535731,2428046038680, 8798879746069,31906100994095] |