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A222286 as a simple table
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 11 |
| 3 | 35 |
| 4 | 208 |
| 5 | 1125 |
| 6 | 6619 |
| 7 | 40321 |
| 8 | 250681 |
| 9 | 1569385 |
| 10 | 9860229 |
| 11 | 62350467 |
| 12 | 395971584 |
| 13 | 2523482587 |
| 14 | 16126203359 |
| 15 | 103311906743 |
| 16 | 663339238220 |
| 17 | 4267302505247 |
| 18 | 27498492193747 |
| 19 | 177468748791963 |
| 20 | 1146905501859999 |
| 21 | 7421110682709531 |
[3,11,35,208,1125,6619,40321,250681,1569385, 9860229,62350467,395971584,2523482587,16126203359, 103311906743,663339238220,4267302505247, 27498492193747,177468748791963,1146905501859999, 7421110682709531] |