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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 23 |
| 4 | 84 |
| 5 | 219 |
| 6 | 569 |
| 7 | 1476 |
| 8 | 3614 |
| 9 | 8730 |
| 10 | 20886 |
| 11 | 49351 |
| 12 | 114833 |
| 13 | 265877 |
| 14 | 610405 |
| 15 | 1396025 |
| 16 | 3172297 |
| 17 | 7195606 |
| 18 | 16230944 |
| 19 | 36563883 |
| 20 | 82008735 |
| 21 | 183813328 |
| 22 | 410490052 |
[1,8,23,84,219,569,1476,3614,8730,20886,49351, 114833,265877,610405,1396025,3172297,7195606, 16230944,36563883,82008735,183813328,410490052] |