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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 8 |
| 3 | 46 |
| 4 | 69 |
| 5 | 227 |
| 6 | 794 |
| 7 | 2701 |
| 8 | 9816 |
| 9 | 34649 |
| 10 | 120536 |
| 11 | 434313 |
| 12 | 1550296 |
| 13 | 5499239 |
| 14 | 19551466 |
| 15 | 69802571 |
| 16 | 249420924 |
| 17 | 889851040 |
| 18 | 3174899619 |
| 19 | 11337371343 |
| 20 | 40485754845 |
| 21 | 144598455899 |
| 22 | 516411037596 |
| 23 | 1844321799338 |
| 24 | 6587372833183 |
[4,8,46,69,227,794,2701,9816,34649,120536,434313, 1550296,5499239,19551466,69802571,249420924, 889851040,3174899619,11337371343,40485754845, 144598455899,516411037596,1844321799338, 6587372833183] |