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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 43 |
| 5 | 211 |
| 6 | 1191 |
| 7 | 7463 |
| 8 | 51535 |
| 9 | 386809 |
| 10 | 3133273 |
| 11 | 27184620 |
| 12 | 251253157 |
| 13 | 2461527511 |
| 14 | 25459020289 |
| 15 | 276987375642 |
| 16 | 3160197122183 |
| 17 | 37705878268985 |
| 18 | 469340324930493 |
| 19 | 6081394853597162 |
| 20 | 81866045488063721 |
| 21 | 1142928276326927223 |
| 22 | 16521454311961005245 |
| 23 | 246917508673451732077 |
[1,1,3,10,43,211,1191,7463,51535,386809,3133273, 27184620,251253157,2461527511,25459020289, 276987375642,3160197122183,37705878268985, 469340324930493,6081394853597162, 81866045488063721,1142928276326927223, 16521454311961005245,246917508673451732077] |