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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 35 |
| 5 | 95 |
| 6 | 258 |
| 7 | 701 |
| 8 | 1905 |
| 9 | 5178 |
| 10 | 14075 |
| 11 | 38259 |
| 12 | 103998 |
| 13 | 282695 |
| 14 | 768444 |
| 15 | 2088847 |
| 16 | 5678074 |
| 17 | 15434605 |
| 18 | 41955606 |
| 19 | 114047161 |
| 20 | 310012325 |
| 21 | 842700869 |
| 22 | 2290698459 |
| 23 | 6226763995 |
| 24 | 16926099417 |
| 25 | 46009908471 |
| 26 | 125067898125 |
| 27 | 339969794796 |
| 28 | 924133715418 |
[1,2,5,13,35,95,258,701,1905,5178,14075,38259, 103998,282695,768444,2088847,5678074,15434605, 41955606,114047161,310012325,842700869,2290698459, 6226763995,16926099417,46009908471,125067898125, 339969794796,924133715418] |