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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 29 |
| 4 | 95 |
| 5 | 317 |
| 6 | 1076 |
| 7 | 3707 |
| 8 | 12935 |
| 9 | 45630 |
| 10 | 162486 |
| 11 | 583338 |
| 12 | 2109190 |
| 13 | 7674157 |
| 14 | 28077250 |
| 15 | 103234695 |
| 16 | 381260535 |
| 17 | 1413686490 |
| 18 | 5260849110 |
| 19 | 19642116150 |
| 20 | 73557465570 |
| 21 | 276224933010 |
| 22 | 1039922723424 |
| 23 | 3924250124142 |
| 24 | 14840700243830 |
[1,3,9,29,95,317,1076,3707,12935,45630,162486, 583338,2109190,7674157,28077250,103234695, 381260535,1413686490,5260849110,19642116150, 73557465570,276224933010,1039922723424, 3924250124142,14840700243830] |