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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 35 |
| 4 | 167 |
| 5 | 727 |
| 6 | 3563 |
| 7 | 16352 |
| 8 | 80886 |
| 9 | 381375 |
| 10 | 1894788 |
| 11 | 9081014 |
| 12 | 45223116 |
| 13 | 219008539 |
| 14 | 1092180415 |
| 15 | 5326794486 |
| 16 | 26587589777 |
| 17 | 130325490701 |
| 18 | 650857372682 |
| 19 | 3202130594494 |
| 20 | 15997600990943 |
| 21 | 78926157160318 |
| 22 | 394405772034276 |
| 23 | 1950061998855125 |
| 24 | 9746377213403280 |
| 25 | 48271355722406643 |
| 26 | 241287269353074424 |
[1,2,9,35,167,727,3563,16352,80886,381375,1894788, 9081014,45223116,219008539,1092180415,5326794486, 26587589777,130325490701,650857372682, 3202130594494,15997600990943,78926157160318, 394405772034276,1950061998855125,9746377213403280, 48271355722406643,241287269353074424] |