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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 36 |
| 4 | 158 |
| 5 | 717 |
| 6 | 3309 |
| 7 | 15375 |
| 8 | 72555 |
| 9 | 344182 |
| 10 | 1640966 |
| 11 | 7863210 |
| 12 | 37826596 |
| 13 | 182448229 |
| 14 | 882425744 |
| 15 | 4277829024 |
| 16 | 20776458752 |
| 17 | 101076141067 |
| 18 | 492491511517 |
| 19 | 2402811356306 |
| 20 | 11736894220444 |
| 21 | 57393337393508 |
| 22 | 280928335727393 |
| 23 | 1376301299048225 |
| 24 | 6748197431155125 |
| 25 | 33112331353842749 |
| 26 | 162589309192203086 |
[1,2,9,36,158,717,3309,15375,72555,344182,1640966, 7863210,37826596,182448229,882425744,4277829024, 20776458752,101076141067,492491511517, 2402811356306,11736894220444,57393337393508, 280928335727393,1376301299048225,6748197431155125, 33112331353842749,162589309192203086] |