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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 27 |
| 4 | 110 |
| 5 | 472 |
| 6 | 2079 |
| 7 | 9353 |
| 8 | 42739 |
| 9 | 197615 |
| 10 | 922243 |
| 11 | 4336704 |
| 12 | 20517659 |
| 13 | 97571226 |
| 14 | 465996270 |
| 15 | 2233748351 |
| 16 | 10741244740 |
| 17 | 51791965769 |
| 18 | 250327475997 |
| 19 | 1212466550103 |
| 20 | 5883588623168 |
| 21 | 28598192874099 |
| 22 | 139214373132978 |
| 23 | 678601421552300 |
| 24 | 3311886380405507 |
| 25 | 16181475316087873 |
| 26 | 79140892444806360 |
[1,2,7,27,110,472,2079,9353,42739,197615,922243, 4336704,20517659,97571226,465996270,2233748351, 10741244740,51791965769,250327475997, 1212466550103,5883588623168,28598192874099, 139214373132978,678601421552300,3311886380405507, 16181475316087873,79140892444806360] |