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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 35 |
| 4 | 167 |
| 5 | 732 |
| 6 | 3564 |
| 7 | 16437 |
| 8 | 80742 |
| 9 | 381990 |
| 10 | 1886365 |
| 11 | 9058918 |
| 12 | 44881863 |
| 13 | 217608631 |
| 14 | 1080496305 |
| 15 | 5273126110 |
| 16 | 26223071353 |
| 17 | 128577465870 |
| 18 | 640125864687 |
| 19 | 3149641710093 |
| 20 | 15693652174663 |
| 21 | 77424611596144 |
| 22 | 386027793424796 |
| 23 | 1908453086549949 |
| 24 | 9519983895827832 |
| 25 | 47143699831058313 |
| 26 | 235260137129936359 |
[1,2,9,35,167,732,3564,16437,80742,381990,1886365, 9058918,44881863,217608631,1080496305,5273126110, 26223071353,128577465870,640125864687, 3149641710093,15693652174663,77424611596144, 386027793424796,1908453086549949,9519983895827832, 47143699831058313,235260137129936359] |