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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 44 |
| 6 | 155 |
| 7 | 607 |
| 8 | 2617 |
| 9 | 12306 |
| 10 | 62587 |
| 11 | 341790 |
| 12 | 1991916 |
| 13 | 12324031 |
| 14 | 80587935 |
| 15 | 554826429 |
| 16 | 4008364544 |
| 17 | 30299290911 |
| 18 | 239019427636 |
| 19 | 1963239741712 |
| 20 | 16755637216417 |
| 21 | 148317595764043 |
| 22 | 1359380603278377 |
| 23 | 12880841117125364 |
| 24 | 126007744452786277 |
| 25 | 1270998629233371388 |
[1,1,2,5,14,44,155,607,2617,12306,62587,341790, 1991916,12324031,80587935,554826429,4008364544, 30299290911,239019427636,1963239741712, 16755637216417,148317595764043,1359380603278377, 12880841117125364,126007744452786277, 1270998629233371388] |