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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 34 |
| 4 | 159 |
| 5 | 679 |
| 6 | 3282 |
| 7 | 14840 |
| 8 | 72574 |
| 9 | 338267 |
| 10 | 1664852 |
| 11 | 7906892 |
| 12 | 39077730 |
| 13 | 187834416 |
| 14 | 930988407 |
| 15 | 4512420506 |
| 16 | 22409638576 |
| 17 | 109278423048 |
| 18 | 543463085071 |
| 19 | 2662193917988 |
| 20 | 13253517464198 |
| 21 | 65149112351615 |
| 22 | 324599977563165 |
| 23 | 1599947951629419 |
| 24 | 7976560232882438 |
| 25 | 39401574021128326 |
| 26 | 196533033150897469 |
[1,2,9,34,159,679,3282,14840,72574,338267,1664852, 7906892,39077730,187834416,930988407,4512420506, 22409638576,109278423048,543463085071, 2662193917988,13253517464198,65149112351615, 324599977563165,1599947951629419,7976560232882438, 39401574021128326,196533033150897469] |