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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 35 |
| 3 | 144 |
| 4 | 564 |
| 5 | 2186 |
| 6 | 8468 |
| 7 | 32856 |
| 8 | 127729 |
| 9 | 497454 |
| 10 | 1940525 |
| 11 | 7580656 |
| 12 | 29651385 |
| 13 | 116111194 |
| 14 | 455138499 |
| 15 | 1785707924 |
| 16 | 7011933544 |
| 17 | 27554583254 |
| 18 | 108355491404 |
| 19 | 426368213364 |
| 20 | 1678704356644 |
| 21 | 6613026412314 |
| 22 | 26064305550054 |
| 23 | 102777232982624 |
[6,35,144,564,2186,8468,32856,127729,497454, 1940525,7580656,29651385,116111194,455138499, 1785707924,7011933544,27554583254,108355491404, 426368213364,1678704356644,6613026412314, 26064305550054,102777232982624] |