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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 14 |
| 4 | 48 |
| 5 | 162 |
| 6 | 826 |
| 7 | 3558 |
| 8 | 17296 |
| 9 | 101714 |
| 10 | 529014 |
| 11 | 3218118 |
| 12 | 21014010 |
| 13 | 140974654 |
| 14 | 888205714 |
| 15 | 6529087674 |
| 16 | 52806013456 |
| 17 | 375280736754 |
| 18 | 2994842092102 |
| 19 | 23821110274230 |
| 20 | 217847892367318 |
| 21 | 1894959770821614 |
| 22 | 16188955616322394 |
| 23 | 142246084665611010 |
| 24 | 1376483692715941594 |
[1,2,4,14,48,162,826,3558,17296,101714,529014, 3218118,21014010,140974654,888205714,6529087674, 52806013456,375280736754,2994842092102, 23821110274230,217847892367318,1894959770821614, 16188955616322394,142246084665611010, 1376483692715941594] |