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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 34 |
| 5 | 128 |
| 6 | 500 |
| 7 | 2043 |
| 8 | 8522 |
| 9 | 36209 |
| 10 | 156692 |
| 11 | 682973 |
| 12 | 3024637 |
| 13 | 13504463 |
| 14 | 60736491 |
| 15 | 275379368 |
| 16 | 1253735435 |
| 17 | 5748912471 |
| 18 | 26479707503 |
| 19 | 122450353484 |
| 20 | 568751348854 |
| 21 | 2648677920527 |
| 22 | 12384471398820 |
| 23 | 58068692798497 |
| 24 | 272954511504642 |
| 25 | 1286574912244069 |
| 26 | 6075287031732405 |
| 27 | 28761263929036976 |
[1,1,3,9,34,128,500,2043,8522,36209,156692,682973, 3024637,13504463,60736491,275379368,1253735435, 5748912471,26479707503,122450353484,568751348854, 2648677920527,12384471398820,58068692798497, 272954511504642,1286574912244069,6075287031732405, 28761263929036976] |