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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 35 |
| 4 | 81 |
| 5 | 278 |
| 6 | 1471 |
| 7 | 3220 |
| 8 | 91631 |
| 9 | 186482 |
| 10 | 1024041 |
| 11 | 3258605 |
| 12 | 7541251 |
| 13 | 25882358 |
| 14 | 136953041 |
| 15 | 299788440 |
| 16 | 8531029361 |
| 17 | 17361847162 |
| 18 | 95340265171 |
| 19 | 303382642675 |
| 20 | 702105550521 |
| 21 | 2409699294238 |
| 22 | 12750602021711 |
| 23 | 27910903337660 |
| 24 | 794255895476191 |
| 25 | 1616422694290042 |
[1,2,11,35,81,278,1471,3220,91631,186482,1024041, 3258605,7541251,25882358,136953041,299788440, 8531029361,17361847162,95340265171,303382642675, 702105550521,2409699294238,12750602021711, 27910903337660,794255895476191,1616422694290042] |