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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 26 |
| 5 | 71 |
| 6 | 213 |
| 7 | 642 |
| 8 | 1987 |
| 9 | 6308 |
| 10 | 20106 |
| 11 | 65821 |
| 12 | 217742 |
| 13 | 724972 |
| 14 | 2444807 |
| 15 | 8272648 |
| 16 | 28263198 |
| 17 | 97285043 |
| 18 | 336031660 |
| 19 | 1168259557 |
| 20 | 4074487345 |
| 21 | 14276504880 |
| 22 | 50258849286 |
| 23 | 177389376533 |
| 24 | 628444989771 |
| 25 | 2231978282075 |
| 26 | 7949659352389 |
| 27 | 28400390532301 |
| 28 | 101664473916666 |
| 29 | 364815675049098 |
| 30 | 1311580822830419 |
[1,2,4,10,26,71,213,642,1987,6308,20106,65821, 217742,724972,2444807,8272648,28263198,97285043, 336031660,1168259557,4074487345,14276504880, 50258849286,177389376533,628444989771, 2231978282075,7949659352389,28400390532301, 101664473916666,364815675049098,1311580822830419] |