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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 35 |
| 4 | 157 |
| 5 | 694 |
| 6 | 3197 |
| 7 | 14762 |
| 8 | 69275 |
| 9 | 326656 |
| 10 | 1552465 |
| 11 | 7408721 |
| 12 | 35521221 |
| 13 | 170851144 |
| 14 | 824310817 |
| 15 | 3986799651 |
| 16 | 19325446717 |
| 17 | 93854226532 |
| 18 | 456581326841 |
| 19 | 2224488457747 |
| 20 | 10852416682457 |
| 21 | 53008446819636 |
| 22 | 259201696707657 |
| 23 | 1268703780469762 |
| 24 | 6215488257084175 |
| 25 | 30475420537665414 |
| 26 | 149539161035357981 |
[1,2,9,35,157,694,3197,14762,69275,326656,1552465, 7408721,35521221,170851144,824310817,3986799651, 19325446717,93854226532,456581326841, 2224488457747,10852416682457,53008446819636, 259201696707657,1268703780469762,6215488257084175, 30475420537665414,149539161035357981] |