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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 35 |
| 4 | 157 |
| 5 | 681 |
| 6 | 3184 |
| 7 | 14449 |
| 8 | 68514 |
| 9 | 318868 |
| 10 | 1528662 |
| 11 | 7224945 |
| 12 | 34859918 |
| 13 | 166473286 |
| 14 | 807330834 |
| 15 | 3883821511 |
| 16 | 18902679334 |
| 17 | 91430966947 |
| 18 | 446307098244 |
| 19 | 2167781051280 |
| 20 | 10605760372222 |
| 21 | 51682964710713 |
| 22 | 253340097702432 |
| 23 | 1237816223983285 |
| 24 | 6077025738208497 |
| 25 | 29756488885651326 |
| 26 | 146285190846706373 |
[1,2,9,35,157,681,3184,14449,68514,318868,1528662, 7224945,34859918,166473286,807330834,3883821511, 18902679334,91430966947,446307098244, 2167781051280,10605760372222,51682964710713, 253340097702432,1237816223983285,6077025738208497, 29756488885651326,146285190846706373] |